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Station One Determine the number of moles in 62.8g of barium acetate.

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Station Two How many formula units are in a 61.8 g sample of potassium phosphite?

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Station Three Determine the number of atoms of nitrogen in 14.8 g of ammonium nitrate.

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Station Four Give the empirical formula of the compound C34H68O12.

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Station Five Find the mass of a sample of C6H6 gas that occupies 56.3 L at STP.

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Station Six At STP, a container is found to contain 54.2 L of CO2. How many moles of carbon dioxide are in the container?

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Station Seven Determine the mass in grams of 3.45x10-3 moles of titanium.

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Station Eight What mass of calcium metal contains the same number of atoms as 12.16g of magnesium?

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Station Nine Calculate the number of molecules present in 2.62x10-6 grams of water.

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Station Ten Calculate the number of atoms of Fe in 151 kg of Fe.

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Station Eleven Calculate the percentage of cation in ammonium chloride.

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Station Twelve Which of the following pairs of compounds have the same empirical formula? C2H2 and C6H6 C2H6 and C4H10 NO2 and N2O4 C12H10O and C6H5OH

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Station Thirteen A compound is known to have a molar mass of g/mol. Find the molecular formula of the compound, given the results of analysis of a 310.8g sample that revealed that the sample contains only boron and iodine. The mass of the iodine in the sample is found to be 302.2g.

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Station Fourteen Determine the empirical formula of a compound containing 2.16g of Al, 3.85g of S, and 7.68g of O.

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Station Fifteen Octane, a compound of hydrogen and carbon, has a molar mass of g/mol. If one mole of the compound contains 18.17g of hydrogen, what is the molecular formula?

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Station Sixteen Find the percentage composition of a compound that contains 1.51g of chromium, 1.13g of K, and 1.62g of O, in a 4.26g sample of the compound.

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Station Seventeen A compound having an approximate molar mass of g has the following percentage composition by mass: carbon, 42.87%, hydrogen, 3.598%, oxygen, 28.55%, and nitrogen. Determine the empirical and molecular formulas of the compound.

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Station Eighteen The compound A2O is 63.7% A (a mystery element) and 36.3% oxygen. What is the identify of element A?

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Station Nineteen A compound with the empirical formula CH2O was found to have a molar mass between 89 and 91g. What is the molecular formula of the compound?

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Station Twenty Calculate the percent by mass of caffeine, C8H10N4O2.

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Station Twenty-One If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide compound is produced that contains 55.06% cobalt by mass. Calculate the empirical formula of the sulfide compound.

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Station Twenty-Two Calculate the number of O atoms in 4.5L of carbon dioxide.

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Station Twenty-Three Give the percent composition of sodium dichromate.

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Station Twenty-Four Calculate the mass of 0.75 mol of lithium acetate.

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Station 25 Which weighs more mol of oxygen atoms or 4 mol of hydrogen atoms? 0.5 mol O2 ( 32 g ) = 16 g O2 1 mol 4 mol H2 ( 2 g ) = 8 g H2

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Station 26 What mass of cobalt contains the same number of atoms as 57 g of fluorine? 57 g F2 ( 1 mol F2 ) = 38 g F2

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Station 27 Consider a 20.0 g sample of silver metal and a 20.0 g sample of another mystery metal. You are told there are exactly 4 times as many atoms of the mystery metal as of silver metal. Identify the mystery metal.

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Station 28 A single molecule of a particular compound has a mass of 4.65 x 10-23g. Which of the following could be this compound? CO H2O NO2 NH3

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Station 29 Calculate the number of grams of iron that contain the same number of atoms as 2.24 g of cobalt.

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Station 30 Consider a 5.0 gram sample of nickel and a 6.0 gram sample of an unknown metal. There are exactly 1/2 as many atoms of the unknown as in the 5.0 gram sample of Ni. What is the unknown metal?

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Chapter 3 Percent Compositions and Empirical Formulas

Chapter 3 Percent Compositions and Empirical Formulas

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