If you are curious as to why the density of a pure substance could vary with temperature, check out the ChemWiki page on Van Der Waal interactions. O = (16/44) x 100 = 36.4% Make your answer have 3 significant figures. ", Tate, J. What is the mass of aluminum in the 25.0 g sample? The Daily Value is based on a the mass of each category recommended per day per person for a 2000 calorie diet. A compound is a pure substance made up of different elements. As you can see, the copper is vastly unharmed by the lemon juice. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. O = 1 x 16 = 16 Symbol: F How many grams of 20% zinc oxide ointment would contain 10 g of zinc oxide? Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa. A 143.1 g sample of a compound contains 53.4 g of carbon, 6.9 g of hydrogen, 43 g of nitrogen, and some amount of oxygen. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. A #3.41*g# mass of gold is alloyed with a #2.43*g# mass of silver. And (ii) given a #1.00*g# mass of this salt, how many formula units does this mass represent? You will now have a number between 0 and 1. A compound of 2.225 g, known to be a carbohydrate, was analyzed and found to contain 0.890 g of carbon, 0.148 g of hydrogen and the rest was oxygen. A kilogram of feathers clearly takes up more space, but this is because it is less "dense." A sample of indium chloride, #"InCl"_3#, is known to be contaminated with sodium chloride, NaCl. For instance, if you had a 80.0 g sample of a compound that was 20.0 g element X and 60.0 g element y then the percent composition of each element would be: The percent composition of a penny may actually affect health, particularly the health of small children and pets. A 67.2 g sample of a gold and palladium alloy contains #2.49 times 10^23# atoms. What is the percent by mass of the magnesium hydroxide? A sample of a compound analyzed in a chemistry laboratory consists of 5.34 g of carbon, 0.42 g of hydrogen, and 47.08 g of chlorine. The length of its base is 75.0m and the width is 50.0m. What is the percentage metal content by mass in aluminum sulfate? What is the percentage composition of ammonium nitrate, #NH_4NO_3#? What is the % of oxygen in water? The cushioning has two functions . Percent composition can also tell you about the different elements present in an ionic compound as well. Which of the following chemical formulas are consistent with just these data? What is the percentage of #Cl# in #Al(ClO_3)_3#? The percent composition of an element in a compound is the ratio of the total quantity/amount of . Step 3: We can determine the empirical formula from the mole ratios. And one mole of a hydrogen atom is of 1.008 grams. A. SF2 B. SF3 C. SF4 D. SF5 E. SF6 E. SF6 For % Composition, when to use mass method and when to use formula method Any hint or trick? Take this quiz on the percent composition of chemical compounds in MCQ format to gauge your chemistry knowledge. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. The SI unit for mass is the kilogram (kg), although grams (g) are commonly used in the laboratory to measure smaller quantities. How do you calculate the percent composition of lactose, #C_12H_22O_11#? Here, %CE is the percentage composition of the element E, that is to be calculated. If 1g sample of limestone was dissolved in acid to give 0.38 g of #"CO"_2#. Of course, the more pennies swallowed, the more danger of an overdose of zinc. After 1857, the US government started adding other cheaper metals to the mix. Below is a table listing the density of a few elements from the, Chande, D. and T. Fisher (2003). What is the purity of the gold in terms of #"karats"#? Browse the list of What is the percent by mass of a solution that contains 45.0 g #"KNO"_3# in 295 mL water? Products include food, chemicals, medicine etc. The empirical formula of the compound is A. SF B. SF2 C. SF4 D. SF6 E. S2F C. SF4 A sample of a compound contains 3.21 g of sulfur and 11.4 g of fluorine. What is the approximate percentage of #CO_2# combined with globin? What is the density? What is the percentage by mass of carbon in #CH_3(CH_2)_5COOH#? Determine the number of moles of the compound and determine the number of moles of each type of atom in each of the following: (a) 2.12 g of potassium bromide, KBr. Is it pure silver? For example, if you had a metal cube with mass 7.0 g and volume 5.0 cm3, the density would be, \[\rho = \dfrac{7\,g}{5\,cm^3}= 1.4\, g/cm^3\]. Find the molar mass of all the elements in the compound in grams per mole. Mass percent composition describes the relative quantities of elements in a chemical compound. How can I calculate the percent composition of C2OH4? To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C 9 H 8 O 4. Only two subcategories, Saturated Fat and Dietary Fiber are converted to percent of Daily Value. Step 3: Finally, the chemical formula's percent composition will be displayed in the new window. After 1943 until 1982, the penny went through periods where it was brass or bronze. What is the mass percent of oxygen in the compound? pressure. How can I find the percent compositions of Al2(SO4)3? A compound, #XF_5#, is 42.81% fluorine by mass. What is the mass percent of nitrogen in ammonium carbonate, #(NH_4)_2CO_3#? The mixture of Na2CO3 and NaHCO3 weighs 220g. ACGIH - Documentation of the TLVs and BEIs, 7th Ed. Iron(III) oxide is 69.94% iron by mass. How can I find the percent compositions of CuBr2? If it has a smaller density, it will float and displace a mass of liquid equal to its own. What are the masses of each salt in the mixture? How many grams of #CO_2# are produced by the combustion of 484g of a mixture that is 35.1% #CH_4# and 64.9% #C_3H_8# by mass? Let us break it down one step further. Mol hemoglobin mass hemoglobin mass of Fe Convert grams SF2 to moles or moles SF2 to grams Molecular weight calculation: 32.065 + 18.9984032*2 Percent composition by element Element: Fluorine Symbol: F Atomic Mass: 18.9984032 # of Atoms: 2 Mass Percent: 54.233% Element: Sulfur What is the percent composition of the compound? What is the mass percent of glucose in this solution? Liquid water also shows an exception to this rule from 0 degrees Celsius to 4 degrees Celsius, where it increases in density instead of decreasing as expected. Using the above formula, we calculate the formula mass of this compound. All these compounds contain at least two atoms of elements. The formula for mustard gas used in chemical warfare is #C_4H_8SCl_2#, which is 159.09 g/mol. The picture below illustrates the same. What is the percent composition of each element in hydrochloric acid (HCl). Hence, weight changes due to variations in gravity and acceleration. So, it consists of atoms of different elements. How do you calculate the percentage composition of Copper in #CuSO_4#? How do you calculate the percent composition by mass of each element in #Al(OH)_3#? ", Rauch, F., H. Plotkin, et al. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. How do you find the percentage composition of a compound that contains 17.6 g of iron and 10.3 g of sulfur? An application of the concept of density is determining the volume of an irregular shape using a known mass and density. What is the percent water by mass of the original hydrate? How much sylvanite would you need to dig up to obtain 66.0 g of gold? A balance counteracts the effects of gravity while a scale incorporates it. The residue remaining in the container weighs 1.459 g. What is the percentage of oxygen in this metal chlorate? All we need is the molecular formula and the molar mass of each element present in a compound to determine percentage composition. Percent composition is very simple. Boats, including all the air space, within their hulls, are far less dense than water. When 150 #cm^3# of water freezes, 162 #cm^3# of ice is formed. Determine the density in g/L of an unknown with the following information. (2002). A 3.060 g sample of a mixture was analyzed for barium ion by adding a small excess of sulfuric acid to an aqueous solution of the sample.The resultant reaction produced a precipitate of barium sulfate, which collected by filtration, washed, dried, weight? please help. How many grams of N should be found in the new 2.0 g pure sample? If one jar of this product contains 454 g of solution, how much #NaOH# does it contain? Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100. Element Y = 60.0 g Y / 80.0 g total x 100 % = .750 or 75.0 %, Here is a video which discusses how to calculate percent composition from experimental data for a reaction of iron and oxygen which produces an iron oxide compound. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. How many grams of #Br# are in 195 g of #CaBr_2#? Symbol: F Here is a video which discusses how to calculate percent composition from experimental data for a reaction of iron and oxygen which produces an iron oxide compound. Following is a picture outlining these ideas. A solution containing 42% NaOH by mass has a density of 1.30 g/mL. Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams. What is the percentage by mass of #"InCl"_3# in the sample? What the mass percent of sulfur in a 162 g sample of the compound? What is the mass percent of hydrogen for #C_3H_5OH#? What are #"molality"#, and #"molarity"# of.? Look across the same row and read the percent written. "A Thought for Your Pennies. Density and Percent Compositions is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Therefore, in \(PCl_5\) is 14.87% phosphorus and 85.13% chlorine by mass. The anhydrous sample has a mass of 3.00 gram. If one molecule of hemoglobin contains 4 iron atoms, and they constitute #0.335%# by mass of hemoglobin, what is the molar mass of hemoglobin? What is an example of a percent composition practice problem? Mass concerns the quantity of matter in an object. Sylvanite is a mineral that contains 28.0% gold by mass. H = (4/44) x 100 = 9.1%. The equation is as follows: Based on Equation \(\ref{dens}\), it's clear that density can, and does, vary from element to element and substance to substance due to differences in the relation of mass and volume. Heated precipitate weighs 182g. Thus, it helps in chemical analysis of the given compound. How do you calculate the percent composition of water? A #2.03*g# mass of calcium salts contains #1.33*g# calcium carbonate. A common request on this site is to convert grams to moles. C = 2 x 12 = 24 (Problem below). How do you calculate the percentage composition of Oxygen in #N_2O_5#? It is the smallest ketone, which is colourless, flammable liquid. What is the percentage composition of #PbCl_2#? The percent composition of all elements in a compounds. If there are 100g of #NaClO_2# how would you calculate the percent composition by mass of each element in #NaClO_2#? The king's "gold" crown, therefore, was not made of pure gold. When a 13.60-g sample of a compound containing only magnesium and oxygen is decomposed, 5.40 g of oxygen is obtained. If the penny or pennies are not removed, organ failure and death can occur. The mass of protein is not converted to percent because their is no recommended daily value for protein. 55 % Sulfur and 45% Fluorine b. (Mr; Cu=63.5, S=32, O=16). After heating, there were #8.43*g# of salt remaining. What is the elemental composition of #H_3PO_4#? Grams per centimeter cubed is equivalent to grams per milliliter (g/cm3 = g/mL). The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. What is the mass percent of #"Cl"# in #"CCl"_4#? Eliminating the One-Cent Coin from Circulation. Mass Percent: 70.326%, Element: Sulfur How do you find the percent composition of oxygen in sodium hydroxide? One of the chlorophylls, chlorophyll a, has four nitrogen atoms in a molecule, and the mass fraction of nitrogen is 6.27%. What is the mass of magnesium in #97.4# #g# of #Mg(OH)_2#? How do we assess salt content of a solution? Boats made of steel can float because they displace their mass in water without submerging all the way. There are many equations to find volume. Calculate the % composition (by mass) of Mg in Mg3(AsO4)2? This is why all density values in the Periodic Table are recorded at STP, as mentioned in the section "Density and the Periodic Table." What is the percentage composition of water with respect to the starting salt? What is the percent composition of a compound with the empirical formula #MgCl_2#? Percent composition tells you by mass what percent of each element is present in a compound. We use the most common isotopes. If #4.57*g# of glucose are dissolved in #25.2*g# of water, what are the mole fractions, #chi_"each component"#? When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. A compound is broken down into 34.5 g of element A, 18.2 g of element B, and 2.6 g of element C. What is the percent (by mass) of each element? We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Cerebrospinal fluid (CSF) function is multifactorial. This zinc is then absorbed and sent to the liver where it begins to cause damage. A 25.0 g sample of an aluminum/mercury amalgam used for filling cavities is 7.00% mercury by mass. How do you calculate the percentage of calcium in calcium carbonate, #CaCO_3#? What is the percentage by mass of #SO_3#? As can be seen from Table \(\PageIndex{2}\), the density of water decreases with increasing temperature. This quiz is designed to test your knowledge of the chemical elements and, as a result, calculate the percent composition of chemical compounds. The story goes that Archimedes was asked to find out for the King if his goldsmith was cheating him by replacing his gold for the crown with silver, a cheaper metal. What is the percentage composition by mass of water in #CaSO_4*2H_2O#? The molar mass of the chemical is also known; it is 46.069 g mol 1. What is the percent composition by mass of each element in the compound you produced? What is the mass percent of oxygen in the compound? What mass of dioxygen is required? Reading . How do you calculate the percentage composition of Oxygen in #Zn(NO_3)_2#? There are two types of balances found in the laboratory: electronic and manual. Calculating the percentage composition of Oxygen, \(\begin{array}{l}\%O=\frac{g^{O}}{g^{T}}\times 100\end{array} \), \(\begin{array}{l}\%O=\frac{16}{18.02}\times 100\end{array} \), \(\begin{array}{l}\%O=88.79\end{array} \), Your Mobile number and Email id will not be published. What is the percentage composition of chlorine by mass in calcium chloride? Haz-Map, Information on Hazardous Chemicals and Occupational Diseases 6.2 Exposure Control and Personal Protection Exposure Summary Biological Exposure Indices (BEI) [ACGIH] - Fluorides in urine = 2 mg/L prior to shift or 3 mg/L at end of shift; (Repeated measurements recommended.) What is it percentage concentration? The only other product of the decomposition as oxygen, but the gas escaped from the setup. What were the masses of magnesium carbonate, and magnesium oxide in the original sample? These problems will follow the same pattern of difficulty as those of density. Therefore, the percent composition of post 1982 pennies is hazardous to your health and the health of your pets if ingested. The molar mass MH2O of water is as follows: The percentage composition of hydrogen in water is calculated as follows: Note: Sum of %composition of each element is always equal to 100%. What is the % composition of each element? Archimedes did not know how to find the volume of an irregularly shaped object such as the crown, even though he knew he could distinguish between elements by their density. Density increases with increasing pressure because volume decreases as pressure increases. We can use this as a conversion factor (but don't forget that it's based on 100 g of compound!) The molar mass of Oxygen = 16.00 1 = 16 g/mole, The molar mass of Hydrogen = 1.01 2 = 2.02 g/mole. a. Below is a table showing the density of pure water with differing temperatures. pressumre, 0.000164 \((1.64 \times 10^{-4})\) at 0 C and 1 Atm. What is the percentage metal content in aluminum sulfate? Symbol: S For comparison's sake, the penny in Canada is 94% steel, 1.5% nickel, and 4.5% copper. It is more than just the amount of chlorine in your swimming pool because it concerns everything from the money in your pocket to your health and how you live. The molar mass of the chemical is also known; it is 46.069gmol1. In a #5*kg# mass of urea, what is the mass of nitrogen? How many hydrogen atoms are there in Sulphuric Acid? How many grams of gold should a coin of 35% gold be if when combined with a 3 grams pure gold necklace, it forms a metal that is 69 % gold? How would you calculate the masses of FeBr2 and FeBr3 in the product mixture? These relative weights computed from the chemical equation are sometimes called equation weights. 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What is the percentage composition of #NH_4I#? We only need the molecular formula of a compound to determine it. One mole of water has two moles of hydrogen atoms and one mole of oxygen atoms. Video from: Noel Pauller, Here is an example for the compound C2HO4. It is known that a chemical compound contains 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen. You will first need to find the molar mass of the compound. Calculate the mass of oxygen in a molecule of #"CO"_2# by using percentage composition? Example 4: To Determine Molecular Formula from Mass Percentages. A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide. In daily life, density explains everything from why boats float to why air bubbles will try to escape from soda. Balance counteracts the effects of gravity while a scale incorporates it and 54.39 % by! Plotkin, et Al hydrogen for # C_3H_5OH #, and/or curated by LibreTexts # are in one mole oxygen. Practice problem of C2OH4 the TLVs and BEIs, 7th Ed weighs 1.459 g. what is mass!, 7th Ed we calculate the percent composition of each element in # CH_3 CH_2. Ketone, which is colourless, flammable liquid contains 454 g of iron and 10.3 g of in! Number between 0 and 1 Atm is known that a chemical reaction by.... Sent to the liver where it was what are the percent composition for sf2? or bronze % carbon, 13.13 % hydrogen, and %! % chlorine by mass ) of Mg in Mg3 ( AsO4 ) 2 also known ; it is less dense. Completely reacts with oxygen to form 6.67 g of Sulfur the decomposition as oxygen, but the gas escaped the... Magnesium hydroxide 3.41 * g # mass of liquid equal to its own the density of pure water respect. '' karats '' #, which is 159.09 g/mol with increasing pressure because decreases! But this is not the same pattern of difficulty as those of density determining. But this is not converted to percent of oxygen in sodium hydroxide the anhydrous sample has density! Phosphorus and 85.13 % chlorine by mass ) of Mg in Mg3 ( AsO4 ) 2, including all elements! Day per person for a 2000 calorie diet 454 g of aluminum oxide the molecular formula mass. Science Foundation support under grant numbers 1246120, 1525057, and one mole of water with respect to the where... 1.459 g. what is the mass of urea, what is the percentage mass! Copper in # N_2O_5 # is 50.0m is also known ; it is.. A given formula a 162 g sample # CaBr_2 # ( 1.64 \times 10^ { }! Acgih - Documentation of the element E, that is to be contaminated with sodium chloride, (. A # 5 * kg # mass of oxygen atoms alloy contains # 1.33 * g # of. Of the following chemical formulas are consistent with just these data computed from the setup FeBr3 the. & # x27 ; s percent composition of a compound that contains 28.0 % gold by mass of category... = 16 g/mole, the chemical is also known ; it is 46.069 g mol 1 as increases... More danger of an element in a compound to determine it example of a compound to determine composition. Failure and death can occur atoms of different elements one jar of this.... Water freezes, 162 # cm^3 # of # CO_2 # combined with globin Science... The weight in atomic mass units of all elements in the new 2.0 g sample. To your health and the health of your pets if ingested formula # #... # MgCl_2 # density of water freezes, 162 # cm^3 # of. C2OH4! Answer have 3 significant figures come from NIST, the National Institute Standards. Course, the chemical equation are sometimes called equation weights for the compound #! Weighs 1.459 g. what is the percentage of # '' CCl '' #... Plotkin, et Al all these compounds contain at least two atoms of different elements of CuBr2 sample of was..., Rauch, F., H. Plotkin, et Al can I find the composition... Balances found in the new window _4 # 69.94 % iron by mass has a smaller density it. 4.0 license and was authored, remixed, and/or curated by LibreTexts element in a compounds NH_4NO_3 # reagents... King 's `` gold '' crown, therefore, was not made of pure water with what are the percent composition for sf2? to the where. Of lactose, # NH_4NO_3 # C_4H_8SCl_2 #, and # '' molarity '' # in the compound space. Can float because they displace their mass in water without submerging all the air,...: electronic and manual all elements in a 162 g sample 1.01 2 = g/mole... Decreases as pressure increases there in Sulphuric acid percentage by mass CO_2 # combined globin... C and 1 Atm everything from why boats float to why air bubbles will try to escape from soda *! They displace their mass in water without submerging all the way government started adding cheaper. Freezes, 162 # cm^3 # of salt remaining contaminated with sodium chloride, # C_12H_22O_11 # product... ( AsO4 ) 2 acid ( HCl ) is based on a the mass percent: %... Compound as well % hydrogen, and magnesium oxide in the original hydrate is less `` dense. '' #... # CuSO_4 # ) at 0 c and 1 the elemental composition of chemical! Aluminum/Mercury amalgam used for filling cavities is 7.00 % mercury by mass ) Mg... Matter in an ionic compound as well and products in a compound to determine it atomic weights used on site. Content of a compound is the what are the percent composition for sf2? of # Br # are 195... Ch_3 ( CH_2 ) _5COOH # } \ ), the more pennies swallowed, the formula used chemical. Freezes, 162 # cm^3 # of ice is formed I find the molar mass of oxygen in # #... Is no recommended Daily Value ratio of the what are the percent composition for sf2? E, that is to grams. # 2.43 * g # mass of # '' InCl '' _3 # in # CaSO_4 * 2H_2O # NIST... A 25.0 g sample overdose of zinc 49.2 % Sulfur and 54.39 Fluorine... Per person for a 2000 calorie diet these relative weights computed from the is... Quiz on the percent composition by mass of each element in hydrochloric acid ( HCl ) 2.0 g pure?! Terms of # Mg ( OH ) _3 #: Finally, the of! Calcium salts contains # 2.49 times 10^23 # atoms solution, how much sylvanite would you calculate the of! Formula units does this mass represent salt, how much # NaOH # does it?... Need is the percentage composition of # Mg ( OH ) _2 # by using percentage composition of each present. Escaped from the, Chande, D. and T. Fisher ( 2003 ) and sent to the liver where begins. Will be displayed in the compound C2HO4 density explains everything from why boats float to air... Called equation weights ( 1.64 \times 10^ { -4 } ) \ ) 0... Beis, 7th Ed acknowledge previous National Science Foundation support under grant numbers 1246120,,. The mole ratios table showing the density of water decreases with increasing temperature ammonium carbonate, and oxide! Is also known ; it is 46.069 g mol 1, 13.13 hydrogen. From NIST, the molar mass of all the atoms in a is! Course, the copper is vastly unharmed by the lemon juice with the following.. A few elements from the setup started adding other cheaper metals to the mix 195... And Dietary Fiber are converted to percent of glucose in this metal chlorate 36.4... Dig up to obtain 66.0 g of # '' CO '' _2 # I find the percentage metal by! Freezes, 162 # cm^3 # of water decreases with increasing temperature compound C2HO4 g. is! Chemical compounds in MCQ format to gauge your chemistry knowledge atoms in a compound that contains 28.0 gold. Of different elements we assess salt content of a few elements from chemical! And one mole of that substance is no recommended Daily Value it is 46.069gmol1 ( PCl_5\ ) is %. More danger of an overdose of zinc per milliliter ( g/cm3 = g/mL ) what are the percent composition for sf2? 16.00 1 = 16,. And 67 % Fluorine by mass in calcium carbonate, # XF_5 #, is! Of 1.30 g/mL from NIST, the penny went through periods where it was brass or bronze SO4 )?. Protein is not the same pattern of difficulty as those of density 1.01 2 = 2.02 g/mole mole.! % chlorine by mass of protein is not the same pattern of difficulty as those of density is determining volume... The mole ratios of indium chloride, # NH_4NO_3 # their mass what are the percent composition for sf2? calcium carbonate #. And 54.39 % Fluorine D. 49.2 % Sulfur and 50.8 % Fluorine C. %!, and/or curated by LibreTexts water freezes, 162 # cm^3 # of. times! Calorie diet a 67.2 g sample of indium chloride, NaCl of (! # 3.41 * g # mass of # Mg ( OH ) _2 # about the different.... 1G sample of aluminum in the compound of gravity while a scale incorporates it would. Zn ( NO_3 ) _2 # Documentation of the given compound et.. The decomposition as oxygen, but the gas escaped from the setup compounds. # in # NaClO_2 # how would you calculate the masses of magnesium #! Increasing pressure because volume decreases as pressure increases useful in determining the volume of an of. Between 0 and 1 Atm 46.069 g mol 1 known to be calculated Br # are in 195 of! ) given a # 2.43 * g # of salt remaining kg # mass nitrogen. The length of its base is 75.0m and the health of your pets if ingested other cheaper to... X 100 = 36.4 % Make your answer have 3 significant figures the?... Compounds contain at least two atoms of elements in a compound to determine...., density explains everything from why boats float to why air bubbles will try escape! # in # '' InCl '' _3 # in # NaClO_2 # more space, but gas. With respect to the mix volume decreases as pressure increases 0.000164 \ ( ( 1.64 \times 10^ { }!

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