REVIEW QUESTIONS
Chapter 6

1. Determine the molar mass for each compound shown below:
   a)
   b)
2. How many chlorine atoms are present in 45 g of chlorine gas ?
3. How many moles are in molecules of ?
4. How many grams does molecules of weigh?
5. What mass of chlorine is present in 12.2 g of ?
6. How many atoms of oxygen are present in 2.15 g of ?
7. Calculate the mass percent composition of each element in .
8. Silver chloride, used in silver plating, contains silver. Calculate the mass of silver chloride required to make 4.8 g of silver plating.
9. The recommended daily allowance (RDA) for iodine is day. How many grams of KI must one consume in order to meet this guideline?
10. Determine the empirical formula for a compound with the following composition:
    11.8% H
    41.1% N
    47.1% S
11. A leak in the air conditioning system of an older car releases 55 g of each month. How much Cl is emitted into the atmosphere by this car in a year?
12. Seawater contains by mass and has a density of . What volume of seawater contains 1.0 g of sodium?
13. A compound whose empirical formula is has a molar mass of . What is the molecular formula for the compound?
14. What is the mass percent of each element in ?
15. A sample of phosphorous reacts with selenium to form 131.6 mg of the selenide. What is the empirical formula of the phosphorous selenide?