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Stoich and LR Test

Total questions: 25

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

2 NaClO3 (s) --> 2 NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?

(a)  

2.

B2H6 + 3 O2 -->2 HBO2 + 2 H2O
 What mass of O2 will be needed to burn 36.1 g of B2H6?

a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
3.

2 CO  +  O2  −-> 2 CO2
How many liters of carbon dioxide are produced from 10 L of carbon monoxide?

(a)  

4.

4 Al + 3 O2 –> 2 Al2O3 

How many moles of aluminum would be needed to completely react with 45 grams of O2?

(a)  

5.

2 Al + 3 H2SO4 -> Al2(SO4)3 + 3 H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?

a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
6.

How many steps will it take me to go from grams to grams?

a)

4

b)

3

c)

2

d)

1

7.

How many step will it take for me to go from grams to moles unknown

a)

1

b)

2

c)

3

d)

4

8.

Using the following equation:
Fe2O3(s) + 3 H2(g) → 2 Fe(s) + 3 H2O(l)
How many grams of iron can be made from 6.00 moles H2? 

(a)  

9.

4 Al + 3 O2 –> 2 Al2O3 

How many grams of aluminum oxide would be needed to completely react with 45.0 grams of O2?

(a)  

10.

Use the following equation:
NaIO3(aq) + 6 HI(aq) --> 3 I2(s) + NaI(aq) + 3H2O(l)
How many moles of iodine can be made from 6.55 moles of NaIO3?

a)
4.55 moles I2
b)
23.18 moles I2
c)
19.65 moles I2
d)
34.99 moles I2
11.

CH4 + O2 → CO2 + H2O (Balance it first)
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?

a)
13.7 mol
b)
2.75 mol
c)
6.11 mol
d)
6.85 mol
12.

4 P + 5 O2 → 2 P2O5
How many grams of P2O5 are produced from the reaction of 124 g of P?

a)

284 g of P2O5

b)

142 g of P2O5

c)

710 g of P2O5

d)

355 g of P2O5

13.

Using the equation

SiO2​+4HF → SiF4 + 2H2O

How many moles of SiF4 can we produce with 6.0 mol of HF?

(Round to 1 Decimal Place)

(a)  

14.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
15.
Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl2.
 
1 Mg +  2 HCl --> 1 MgCl2  +  1 H2   
 
a)
Mg
b)
H2
c)
MgCl2
d)
HCl
16.
The limiting reactant . . .
a)
slows the reaction down.
b)
is used up first.
c)
is the reactant that is left over.
d)
controls the speed of the reaction.
17.
Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
d)
None
18.
When does a chemical reaction stop?
a)
When the lab is finished.
b)
When the excess reactant is used. up
c)
When the limiting reactant is used up.
d)
Chemical reactions never stop.
19.
When 12 moles of O2 reacts with 6 moles of C10H8, what is the limiting reactant?  
1 C10H8 + 12 O2 --> 10 CO2 + 4 H2O
a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
20.
The Formula to make S'mores is:
2C + 1M + G2 → C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?
a)
5
b)
4
c)
8
d)
42
21.

The reactant that is not completely used up in a chemical reaction is called the __________ .

a)

spectator reagent

b)

limiting reagent

c)

excess reagent

d)

catalyst

22.

Which reactant is the limiting reagent and why?

2H2(g) + O2(g) → 2H2O(l)

a)

Hydrogen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

b)

Oxygen is the limiting reagent because two moles of hydrogen is required for every one mole of oxygen to produce two water.

23.
When you use a balanced chemical equation to calculate the amount of a product on paper it is referred to as the 
a)
experimental value
b)
theoretical value
c)
true amount
d)
percent yield
24.
P4 + 3O2 --> P4O6 
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
25.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield

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