WorksheetsIntroduction to Limiting Reactant
Total questions: 29
Worksheet time: 23mins
Name
Class
Date
1.
4NH3 + 5O2 --> 4NO + 6H2O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?
a)
0.37g
b)
0.045g
c)
1.35g
d)
11.1g
2.
P4 + 6Cl2 --> 4PCl3
The reaction of 75.0g P4 with excess chlorine gas produces 110g PCl3 in lab. Find the theoretical yield and calculate percent yield for the reaction.
The reaction of 75.0g P4 with excess chlorine gas produces 110g PCl3 in lab. Find the theoretical yield and calculate percent yield for the reaction.
a)
78%
b)
64%
c)
27%
d)
33%
3.
SO2 + PCl5 --> SOCl2 + POCl3
How much SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?
How much SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?
a)
7.87g
b)
30.1g
c)
26.4g
d)
19.8g
4.
SO2 + PCl5 --> SOCl2 + POCl3
How much of the excess is left over when 16.2g SO2 react with 13.7g PCl5?
How much of the excess is left over when 16.2g SO2 react with 13.7g PCl5?
a)
13.0g
b)
3.16g
c)
70.3g
d)
54.1g
5.
P4 + 3O2 --> P4O6
What is the limiting reactant is 12 moles of P4 react with 15 moles of O2?
What is the limiting reactant is 12 moles of P4 react with 15 moles of O2?
a)
P4
b)
O2
c)
P4O6
d)
none of the above
6.
Al + HBr --> AlBr3 + H2
Balance the following equation. What is the coefficient for HBr?
Balance the following equation. What is the coefficient for HBr?
a)
2
b)
6
c)
3
d)
1
7.
Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?
If 7.62g Fe react with 8.67g S, what is the limiting reactant?
a)
Fe
b)
S
c)
FeS
d)
none
8.
How many grams of FeS are formed from 7.62g of Fe reacted with excess S?
a)
3.82g
b)
7.62g
c)
12.2g
d)
11.4g
9.
C3H8 + 5O2 --> 3CO2 + 4H2O
How much carbon dioxide is produced when 3.0g of propane is burned in 2.1g of oxygen?
How much carbon dioxide is produced when 3.0g of propane is burned in 2.1g of oxygen?
a)
0.55g
b)
0.038g
c)
2.9g
d)
0.90g
10.
When does a reaction stop?
a)
When it wants to
b)
When both the limiting and excess reactants are gone
c)
When all the excess reactant has been consumed
d)
When all the limiting reactant has been consumed
11.
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
12.
MnO2 + 4HCl --> MnCl2 + Cl2 + 2H2O
How many grams of Cl2 are produced when 0.45moles of MnO2 react with 48.2g HCl?
How many grams of Cl2 are produced when 0.45moles of MnO2 react with 48.2g HCl?
a)
36.5g
b)
23.4g
c)
12.9g
d)
27.1g
13.
2 NaCl + Pb(NO3)2 --> 2 NaNO3 + PbCl2
How many grams of lead II chloride are produced from the reaction of 15.3 g of NaCl and 60.8 g of Pb(NO3)2?
How many grams of lead II chloride are produced from the reaction of 15.3 g of NaCl and 60.8 g of Pb(NO3)2?
a)
21.5g
b)
51.1g
c)
43.4g
d)
36.4g
14.
CH4 + 2H2O --> CO2 + 4H2
What is the limiting reactant when 20g CH4 react with 15g H2O?
What is the limiting reactant when 20g CH4 react with 15g H2O?
a)
CH4
b)
H2O
c)
CO2
d)
H2
15.
What is the amount produced in a perfect reaction called?
a)
Theoretical yield
b)
Actual yield
c)
Percent Yield
d)
Stoichiometry
16.
Using the pictured equation, how many moles of hydrogen can you make with 7.9 g Zn?
a)
.12 g
b)
.121 g
c)
520 g
d)
517 g
17.
Using the pictured equation, how many grams of zinc chloride are produced from 7.89 moles of zinc?
a)
1075 g ZnCl2
b)
1080 g ZnCl2
c)
.05789 g ZnCl2
d)
.0579 g ZnCl2
18.
4.3 grams of sodium reacts with 2.6 grams of oxygen to produce 6.2 grams of sodium oxide. What's the limiting reactant?
a)
Na
b)
NaO
c)
O2
19.
4.3 grams of sodium reacts with 2.6 grams of oxygen to produce 6.2 grams of sodium oxide. Using Na as your limiting reactant, what is your theoretical yield?
a)
5.8 g
b)
5.796 g
c)
10.07 g
d)
10. g
20.
4.3 grams of sodium reacts with 2.6 grams of oxygen to produce 6.2 grams of sodium oxide. Determine the percent yield? (Hint: You need to calculated the theoretical yield.)
a)
107%
b)
93.5%
c)
6.98%
d)
99.9%
21.
4.3 grams of sodium reacts with 2.6 grams of oxygen to produce 6.2 grams of sodium oxide. Determine the excess reactant left over at the end of the reaction.
a)
1.10 g
b)
1.7 g
c)
1.28 g
d)
3.6 g
22.
The amount of product formed depends on the excess reactant
a)
True
b)
False
23.
If the percentage yield is equal to 100%, then
a)
the actual yield is greater than the theoretical yield
b)
the actual yield is less than the theoretical yield
c)
the actual yield is equal to the theoretical yield
d)
there was no limiting reactant
24.
To determine the limiting reactant in a chemical reaction, one must know the
a)
amount of product formed
b)
available amount of one of the reactants
c)
available amount of each of each reactant
d)
speed of the reaction
25.
The actual yield of a chemical reaction is generally
a)
less than the theoretical yield
b)
equal to the theoretical yield
c)
greater than the theoretical yield
d)
greater than the percentage yield
26.
For the reaction represented by the equation Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3, how many moles of lead(II) iodide are produced from 239 g of potassium iodide and an excess of lead(II) nitrate?
a)
1.44 mol
b)
0.722 mol
c)
1.44 mol
d)
0.720 mol
27.
Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl2.
Mg + 2HCl --> MgCl2 + H2
Mg + 2HCl --> MgCl2 + H2
a)
Mg
b)
H2
c)
MgCl2
d)
HCl
28.
Based on the molecular view of the chemical reaction between 4 moles of H2 and 6 moles of Cl2, which is the limiting reactant? (You will need to be able to draw something like this on the test.)
a)
H2
b)
Cl2
c)
HCl
d)
They are both limiting reactants
29.
Based on the molecular view of the chemical reaction between 10 moles of H2 and 7 moles of O2, which is the excess? (You will need to be able to draw something like this on the test.)
a)
H2
b)
O2
c)
H2O
d)
both are excesses
100 %
