REVIEW QUESTIONS
Chapter 6

  1. Determine the molar mass for each compound shown below:
    a)
Molar mass
b)
Molar mass
2. How many chlorine atoms are present in 45 g of chlorine gas ?
  1. How many moles are in molecules of ?
  1. How many grams does molecules of weigh?
  1. What mass of chlorine is present in 12.2 g of ?
  1. How many atoms of oxygen are present in 2.15 g of ?
    atoms of O
  2. Calculate the mass percent composition of each element in .
  1. Silver chloride, used in silver plating, contains silver. Calculate the mass of silver chloride required to make 4.8 g of silver plating.
  1. The recommended daily allowance (RDA) for iodine is day . How many grams of KI must one consume in order to meet this guideline?
  1. Determine the empirical formula for a compound with the following composition:
    41.1% N
    11.8% H
    47.1% S



    (8) Formula is
  2. 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 months (2 sig figs)
12. Seawater contains by mass and has a density of . What volume of seawater contains 1.0 g of sodium?
seawater

Alternate solution:

  1. A compound whose empirical formula is has a molar mass of . What is the molecular formula for the compound?
  1. What is the mass percent of each element in ?
  1. A sample of phosphorous reacts with selenium to form 131.6 mg of the selenide. What is the empirical formula of the phosphorous selenide?