Name ____________________
CHEM 1004
Quiz #3
Spring 2011
1. (5 points) Balance the following equations.
Na2SO4 (aq) →
a.
AgNO3 (aq) +
b.
NH4NO3 (s) →
c.
C5H6O (ℓ)
d.
Li (s) + N2 (g)
e.
Al4C3 (s) +
N2 (g) +
+
O2
→
→
H2O (ℓ)
Ag2SO4 (s) +
O2 (g) +
CO2 (g)
+
NaNO3 (aq)
H2O (g)
H2O (g)
Li3N (s)
→
Al(OH)3 (s) + CH4 (g)
2. (8 points) Answer the following questions. Show your work to receive full credit.
a. What is the molar mass of (NH4)2SO4?
b. How many grams of (NH4)2SO4 are in 4.75 mol of (NH4)2SO4?
c. How many mol of (NH4)2SO4 are in 875 g of (NH4)2SO4?
d. How many moles of nitrogen atoms are in 1 mole of (NH4)2SO4?
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3. The air bags in automobiles inflate when sodium azide, Na3N, decomposes rapidly to
form nitrogen gas according to the equation:
Na3N (s) →
Na (s)
+
N2 (g)
a. Balance the equation.
b. How many grams of nitrogen gas could be formed if 500 g of Na3N is
decomposed? Show your work.
c. If every 28 g of N2 gas occupy 22 L, how many L would the gas created in part b
occupy?
d. How many grams of Na would be formed by the decomposition of 500 g of
Na3N?
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