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Worksheet: Mass/Mass Problems
Name
1. Nitrogen and hydrogen react to form ammonia gas according to the following
equation.
N
NH
H
a. If 56.0 grams of nitrogen are used up by the reaction, how many grams of
ammonia will be produced? ( < ° ^ /
b. How many grams of hydrogen must react if the reaction needs to produce
63.5 grams of ammonia?
2. Aluminum metal reacts with zinc chloride to produce zinc metal and aluminum
chloride.
Al
ZnCI
Zn +
AlCI
a. A mass of 45.0 grams of aluminum will react with how many grams of zinc
chloride?
b- What mass of aluminum chloride will be produced if 22.6 grams of zinc
chloride are used up in the reaction?
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CHEMISTRY: A Study of Matter
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8.20
3. For the reaction whose balanced equation is as follows, find the number of
grams of I2 that will be formed when 300.0 g of bromine react. [ -4oi> ^/
2 KI + Br
2 KBr
4. For the reaction whose balanced equation is as follows, find the number of
grams of sodium that must react to produce 42.0 grams of sodium oxide. £5
4 Na + O
2 Na 2 0
5. For the reaction whose balanced equation is as follows, find how many grams of
zinc phosphate wilt be produced by the reaction of 5.00 grams of ammonium
phosphate.
i b>
3 ZnClz + 2 (NH4)3P04 -> Zn3(P04)
CHEMISTRY: A Study of Matter
Name:
Date:
P
R
S
Honors Chemistry
Percent, Actual, and Theoretical Yield Worksheet
1)
LiOH + KC1 -» LiCl + KOH
a) I began this reaction with 20 grams of lithium hydroxide. What is my theoretical yield of lithium
chloride? (35.5 grams)
b) I actually produced 6 grams of lithium chloride. What is my percent yield? (16.9%)
2)
C 3 H 8 + 5 O2 •* 3 C02 + 4 H2O
a) If I start with 5 grams of CsHg, what is my theoretical yield of water? (8.1 grams)
b) I got a percent yield of 75% How many grams of water did I make? (6.1 grams)
3)
Be + 2 HC1 -» BeCh + H2
My theoretical yield of beryllium chloride was 10.7 grams. If my actual yield was 4.5 grams, what
was my percent yield? (42.1 %)
4)
2 NaCl + CaO -> CaCh + Na2O
What is my theoretical yield of sodium oxide if I start with 20 grains of calcium oxide? (22.1 grams)
5)
FeBr2 + 2 KC1 -> FeCh + 2 KBr
a) What is my theoretical yield of iron (II) chloride if I start with 34 grams of iron (II) bromide?
(20.0 grams of FeCh)
b) What is my percent yield of iron (II) chloride if my actual yield is 4 grams? (20 %)
6)
TiS + H2O -} H2S + TiO
What is my percent yield of titanium (II) oxide if I start with 20 grams of titanium (II) sulflcle and'my
actual yield of titanium (II) oxide is 22 grams? (137.5 %)
7)
U + 3 Br2 ^ UBr6
What is my actual yield of uranium hexabromide if 1 start with 100 grams of uranium and get a
percent yield of 83%? (301.4 grams UBre)
8)
H2SO4 •* H2O + SO3
If I start with 89 grams of sulfuric acid and produce 7.1 grams of water, what is my percent yield?
(250.2 grams)
Limiting Reactant and Percent Yield Practice
Name
1)
Consider the following reaction:
NH4NO3 +
Na3PO4
(NH 4 ) 3 PO 4 +
NaNO
Which reactant is limiting, assuming we started with 30.0 grams of ammonium
nitrate and 50,0 grams of sodium phosphate, What is the mass of each product
that can be formed? What mass of the excess reactant(s) is left over? 'C
2)
Consider the following reaction:
CaC03 + FeP04
Ca 3 (P0 4 ) 2 +
Fe2(CO3)3
Which reactant is limiting, assuming we start with 100. grams of calcium
carbonate and 45.0 grams of iron (III) phosphate. What is the mass of each
product that can be formed? What mass of the excess reactant(s) is left over?
r
3)
Write the balanced equation for the reaction given below:
CuCI 2 + NaNO 3 -^
Cu(NO3)2 + NaCI
a)
If 1 5 grams of copper (II) chloride react with 20. arams of sodium nitrate,
how much sodium chloride can be formed? C
b)
What is the name of the limiting reagent?
c)
How much of the excess reagent is left over in this reaction?
d)
If 11.3 grams of sodium chloride are formed in the reaction, what is the
percent yield of this reaction? / p ~1 &f\
(_ / 0. )