moles and balancing equations
Copper reacts with silver nitrate through sin-
gle replacement. If 4.22 g of silver are pro-
duced from the reaction, how much copper(II)
nitrate is also produced? Answer in units of
mol.
078 (part 2 of 3) 10 points
How much Cu is required in this reaction?
Answer in units of mol.
079 (part 3 of 3) 10 points
How much AgNO3 is required in this reaction?
Answer in units of mol.
080 (part 1 of 3) 10 points
Aspirin (C9 H8 O4 ) is produced through the
following reaction of salicylic acid (C7 H6 O3 )
and acetic anhydride (C4 H6 O3 ).
C7 H6 O3 (s) + C4 H6 O3 ( __
C9 H8 O4 (s) + HC2 H3 O2 (
of aspirin could be produced from 171 mol of
salicylic acid? Answer in units of kg.
081 (part 2 of 3) 10 points
What mass of acetic anhydride would be re-
quired? Answer in units of kg.
082 (part 3 of 3) 10 pointsAt 20_ C, how much acetic acid (HC2 H3 O2 )
would be formed? The density of HC2 H3 O2 is
1.05 g/cm3 . Answer in units of L.
083 (part 1 of 1) 10 points
Phosphate baking powder is a mixture of
starch, sodium hydrogen carbonate, and cal-
cium dihydrogen phosphate. When mixed
with water, phosphate baking power releases
carbon dioxide gas, causing a dough or batter
to bubble and rise.
2 NaHCO3 (aq) + Ca(H2 PO4 )2 (aq) _
Na2 HPO4 (aq) + CaHPO4 (aq)
+2 CO2 (g) + 2 H2 O(l)
If 2.51 L of CO2 is needed for a cake and
each kilogram of baking power contains 168 g
of NaHCO3 , how much baking powder must
be used to generate this amount of CO2 ? The
density of CO2 at baking temperature is about
1.20 g/L. Answer in units of g.
084 (part 1 of 1) 10 points
Builders and dentists must store plaster of
Paris
4 • 1
2 H
2 O
in airtight contain-
ers to prevent it from absorbing water va-
por from the air and changing to gypsum
(CaSO4 • 2H2 O). How much water evolves
when 6.9 L of gypsum are heated at 110_ C to
produce plaster of Paris? At 110_ C, the den-
sity of CaSO4 • 2H2 O is 2.32 g/mL, and the
density of water vapor is 0.581 g/mL. Answer
in units of L.
085 (part 1 of 1) 10 points
Gold can be recovered from sea water by re-
acting the water with zinc, which is refined
from zinc oxide.
2 ZnO(s) + C(s) __ 2 Zn(s) + CO2 (g)
2 Au3+(aq) + 3 Zn(s) __
3 Zn2+(aq) + 2 Au(s)
The zinc displaces the gold in the water.
What mass of gold can be recovered if 8.3 g of
ZnO and an excess of sea water are available?
excess oxygen gas, how many grams of H2 O
are formed? MWC = 12.011 g/mol, MWH =
1.00794 g/mol, and MWO = 15.9994 g/mol.
Answer in units of g.
087 (part 1 of 1) 10 points
When 89 g of isobutyl formate, which has
an empirical formula of C5 H10 O2 , is burned
in excess oxygen gas, how many grams of
CO2 are formed? MC = 12.011 g/mol, mH =
1.00794 g/mol, and mO = 15.9994 g/mol.
Answer in units of g.
088 (part 1 of 1) 10 points
It is a fact that limestone decomposes into a
fixed air (a gas) and a solid called lime. A
sample (13.8 g) of limestone was heated to a
constant mass of 6.4 g. How much fixed air
does the limestone contain? Answer in units
of g.
089 (part 1 of 1) 10 points
How many grams of Fe3 O4 could be pro-
duced from 33 cm3 of iron metal (density
7.86 g/cm3 ) if it all reacted?
090 (part 1 of 1) 10 points
How many grams of SnO2 could be produced
from 15 cm3 of tin metal (density 7.28 g/cm3 )
if it all reacted?
091 (part 1 of 1) 10 points
How many cubic centimeters of zinc (density
7.14 g/cm3 ) are required to produce 13 grams
of zinc chloride? Answer in units of cm3 .
092 (part 1 of 1) 10 points
How many oxygen molecules can be made
from 15 g of water? Answer in units of
molecules.
093 (part 1 of 1) 10 points
6.9 g of magnesium, when heated in air, pro-
duces 23 g of product. Answer in units of g.
086 (part 1 of 1) 10 points
When 89 g of isobutyl formate which has
an empirical formula of C5 H10 O2 is burned in
What is the mass of oxygen present in the
product? Answer in units of g.
094 (part 1 of 1) 10 points
Given the equation
Herreros, Stephen – Homework 2 – Due: Feb 25 2007, midnight – Inst: Sergio Cartas 9
Zn(s) + 2 HCl(aq) _ ZnCl2 (aq) + H2 (g),
what mass of hydrogen gas is produced when
3.4 g Zn is reacted with excess aqueous hy-
drocholric acid? Answer in units of g.
095 (part 1 of 1) 10 points
Given the reaction
2 C2 H2 (g) + 5 O2 (g) _
4 CO2 (g) + 2 H2 O(g) ,
how much oxygen gas is needed for the
complete combustion of 181 g of acetylene
(C2 H2 )? Answer in units of g.
096 (part 1 of 1) 10 points
Calculate the mass of water formed by the
complete reaction of 886 g of propane (C3 H8 )
with excess oxygen. (Write a balanced equa-
tion.) Answer in units of g.
097 (part 1 of 1) 10 points
How many grams of CO2 can be obtained
from the complete combustion of 67 grams of
octane? Answer in units of g.
