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CS2 Stoichiometry

Total questions: 40

Worksheet time: 50mins

Name
Class
Date
1.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
2.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
3.
WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
a)
1
b)
2
c)
3
d)
4
4.
True or False. You must convert grams to moles to do stoichiometry.
a)
True
b)
False
5.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
6.
What is a Limiting Reagent?
a)
speeds up a reaction
b)
what you run out of first
c)
what you have left over
d)
slows down a reaction
7.
What is a Excess Reagent?
a)
amount you end with
b)
what you run out of first
c)
what you have left over
d)
what you start with
8.
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
9.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
10.

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)

False

11.

How many conversion factors are needed to answer this question: 25.00 g of O2 are produced. How many moles of water reacted?


2H2O --> 2H2 + O2

a)

1

b)

2

c)

3

d)

4

e)

0

12.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
13.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
14.
CH4 + 2 O2 → CO2 + 2 H2O
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
15.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
16.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
17.
O2 + CS2 --> CO2 + SO2
What coefficient would go in front of the O2?
a)
1
b)
2
c)
3
d)
4
18.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
19.

How many grams are in one mole of Oxygen

a)

16

b)

32

c)

8

d)

31.98

20.
 SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
a)
96 g
b)
0.67 g
c)
2.67 g
d)
48 g
21.

What is the mass in grams of 2.3456 moles of W?

a)

431.22 grams

b)

6.02 grams

c)

207.2 grams

d)

486.01 grams

22.

How many moles are in 1459 grams of Na?

a)

63.46 moles

b)

60.36 moles

c)

10 moles

d)

1 mole

23.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
24.

If you start with 3.88 x 1024 atoms of Na and an excess of Cl2, how many grams of NaCl should you get? [Use paper & calculator for this one. Start by changing atoms to moles.]

2Na + Cl2 −−〉 2NaCl

a)

376.66

b)

6.45

c)

753.31

d)

188.33

25.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
26.
What is the mole ratio in the following reaction:
2CO  +  O2  → 2CO2
a)
2:1:2
b)
1:1:1
c)
1:2:1
d)
Have no clue what a mole ratios is!!
27.

CH4 + 2 O2 → CO2 + 2 H2O

How many moles of carbon dioxide are produced from the combustion of 110 g of CH4? [Need paper & calculator for this mass-moles problem.]

a)

13.7 mol

b)

2.75 mol

c)

6.11 mol

d)

6.85 mol

28.

2Na + 2H2O → 2NaOH+ H2

How many grams of hydrogen are produced if 120 g of Na are available? [Need paper & calculator for this mass-mass problem.]

a)

5.2 g

b)

2.6 g

c)

690 g

d)

45 g

29.
What do we call the SI unit for amount of a substance?
a)
Avogadros number
b)
kilogram
c)
mole
d)
liter
30.

Where do you look to calculate the molar mass?

a)

avogadro's number

b)

periodic table

c)

The paper of the student next to me

d)

TikTok

31.
What is the mole ratio between Cu and Ag?
1Cu + 2AgNO3 →1Cu(NO3)2 +2 Ag
a)
1 mole Cu : 1 mole Ag
b)
1 mole Cu : 2 mole Ag
c)
2 mole Cu : 1 mole Ag
d)
1 mole AgNO3 : 1 mole Ag
32.
2CO  +  O2 → 2CO2
How many moles of  CO2 (carbon dioxide) are produced from 10 moles of carbon monoxide (CO)?
a)
10
b)
20
c)
1
d)
5
33.

How many grams are there in 31.8 moles of water? (H2O has a molar mass of 18.0 g/mol)

a)

572 g

b)

1.91 x 1025 molecules

c)

5.28x 1025 molecules

d)

1.77 g

34.

Calculate the number of moles of chlorine atoms in 55g of copper (II) chloride.

a)

0.41 moles

b)

0.82 moles

c)

1.6 moles

d)

.20 moles

35.

True or False. You must convert grams to moles to establish stoichiometric ratios in a chemical reaction.

a)

True

b)

False

36.
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
37.

Cl2 + 2 KBr → Br2 + 2 KCl

How many grams of potassium chloride (KCl) can be produced from 356 g of chlorine and 356 g of potassium bromide (KBr)?

a)

749 g

b)

223 g

c)

479 g

d)

814 g

38.
B2H6 + 3O2 -->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
39.
4 Al + 3 O2 –> 2 Al2O3  How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
40.

What is the molar mass of NaOH?

a)

40.00 g/mol

b)

38.99 g/mol

c)

23.99 g/mol

d)

57.00 g/mol

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