Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.


1.

Given the
reaction:
2 PbO > 2 Pb + O_{2}
What is the total volume of
O_{2}, measured at STP, produced when 1.00 mole of PbO decomposes? a.  5.60 L  b.  11.2
L  c.  22.4 L  d.  44.8
L         


2.

A sample of an
unknown gas at STP has a density of 0.630 grams per liter. What is the molar mass of this
gas? a.  2.81 g/mole  c.  22.4 g/mole  b.  14.1 g/mole  d.  63.0 g/mole     


3.

Given the balanced
equation: C_{3}H_{8} + 5 O_{2} > 3
CO_{2} + 4 H_{2}O
What is the total number of liters of CO_{2}
produced when 20.0 liters of O_{2} are completely consumed? a.  12.0 L  b.  22.4
L  c.  3.00 L  d.  5.00
L         


4.

Given the balanced
equation: Ca + 2 H_{2}O > Ca(OH)_{2} +
H_{2}
When 80.2 grams of Ca react completely with the water, what is the total volume, at
STP, of H_{2} produced? a.  1.00 L  b.  2.00
L  c.  22.4 L  d.  44.8
L         
