station one determine the number of moles in 62.8g of barium acetate
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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?
Station Twelve
Which of the following pairs of compounds have the same empirical formula?
a. C2H2 and C6H6
b. C2H6 and C4H10
c. NO2 and N2O4
d. C12H10O and C6H5OH
Station Thirteen
A compound is known to have a molar mass of 391.5 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.
Station Fourteen
Determine the empirical formula of a compound containing 2.16g of Al, 3.85g of S, and 7.68g of O.
Station Fifteen
Octane, a compound of hydrogen and carbon, has a molar mass of 114.26g/mol. If one mole of the compound contains 18.17g of hydrogen, what is the molecular formula?
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.
Station Seventeen
A compound having an approximate molar mass of 165-170g 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.
Station Eighteen
The compound A2O is 63.7% A (a mystery element) and 36.3% oxygen. What is the identify of element A?
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?
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.
Station 25
Which weighs more - 0.5 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
1 mol
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
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.
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
Station 29
• Calculate the number of grams of iron that contain the same number of atoms as 2.24 g of cobalt.