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Moles Ratios ( Require/given) & Molarity

Total questions: 62

Worksheet time: 3hrs 52mins

Name
Class
Date
1.
Given the reaction: 4Al + 3O2 --> 2Al2O3
How many moles of Aluminum oxide do you have if you have 2 moles of Al?
a)
3 mole
b)
2 mole
c)
1 mole
d)
0.5 mole
2.
N2 +  3H2 → 2NH3 
What is the mole ratio between Nitrogen and Ammonium in the above reaction?
a)
1 moles NH3 / 2 moles N2 
b)
2 moles NH3 / 1 moles N2 
c)
2 moles N2 / 3 moles NH3 
d)
1 moles N2 / 3 moles NH3 
3.
2Na + S -->Na2S
What is the total number of moles of S that reacts when 4.0 moles of Na were completely consumed?
a)
1
b)
2
c)
0.5
d)
4
4.
4NH3 + 5O2-->4NO + 6H2O
What is the total number of moles of H2O produced when 12 mole of NH3 is completely consumed?
a)
15
b)
18
c)
20
d)
24
5.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
6.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of CO2 needed to make 2 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
7.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
8.
What number should be in front of N2 in this chemical equation?
___N2+___F2 --> ___ NF3
a)
1
b)
2
c)
3
d)
4
9.

3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe What is the Ratio of moles of Mg to moles Fe (I have Fe, find Mg)

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.
H2+Cl2-->2HCl
How many moles of Cl2 are needed to react with 3 moles of H2?
a)
5
b)
2
c)
3
d)
6
11.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of CO2 needed to make 2 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
12.
H2+Cl2-->2HCl
What is the total number of moles of HCl produced when 3 moles of H2 is completely consumed?
a)
5
b)
2
c)
3
d)
6
13.
2Na + S -->Na2S
What is the total number of moles of Na2S produced when 8.0 moles of Na were completely consumed?
a)
1
b)
2
c)
0.5
d)
4
14.

Where does the mole ratio come from?

a)

the molar mass of the reactants in the balanced chemical equation

b)

the coefficients of the balanced chemical equation

c)

the subscripts of the products in the balanced chemical equation

d)

the group number of each element in the balanced chemical equation

15.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas ( I want ethane and I know O2)

a)
b)
c)
d)
16.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water ( I want CO2 & I know water)

a)
b)
c)
d)
17.

1 P4 + 3 O2 → 2 P2O3

Match the ratio to the correct substances:

a)

1:3

1.

P:O2

b)

1:2

2.

P:P2O3

c)

3:2

3.

O2:P2O3

d)

3:1

4.

O2:P

e)

2:3

5.

P2O3:O2

18.

3 CaCl2 + 2 Na3PO4 → Ca3(PO4)2 + 6 NaCl

What is the mole ratio of NaCl to Ca3(PO4)2?

a)

1:6

b)

6:1

c)

2:3

d)

3:2

19.

S8 + 12 O2 → 8 SO3


How many moles of S8 is needed to react with 3 moles of O2?

a)

0.25

b)

1

c)

4

d)

36

20.

N2 + 3H2 → 2NH3

How many moles of N2 are needed to produce 3.5 moles of NH3?

(a)  

21.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

How many moles of CO2 are produced when 3 moles of H2O are also produced?

(a)  

22.

2H2 + O2 → 2H2O

How many moles of H2O are produced when 8 moles of H2 react?

(a)  

23.

S8 + 12 O2 → 8 SO3

How many moles of S8 are needed to produce 12 moles of SO3?

(a)  

24.

N2 + 3H2 → 2NH3

How many moles of H2 are needed to react with 2 moles of N2?

(a)  

25.

What are the missing coefficients for the unbalanced equation below?

Cr(s) + Fe(NO3)2(aq) → Fe(s) + Cr(NO3)3(aq)

a)

2,3,3,2

b)

1,3,3,1

c)

2,3,2,3

d)

2,3,1,2

26.

What are the missing coefficients for the unbalanced equation below?

AlPO4 + Ba(OH)2 → Al(OH)3 + Ba3(PO4)2

a)

1,3,2,3

b)

2,3,2,3

c)

3,2,3,1

d)

2,3,2,1

27.
4NH3 + 5O2-->4NO + 6H2O
What is the total number of moles of H2O produced when 12 mole of NH3 is completely consumed?
a)
15
b)
18
c)
20
d)
24
28.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?

a)

4 mol H2O

b)

6 mol H2O

c)

24 mol H2O

d)

96 mol H2O

e)

384 mol H2O

29.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

If 3.5 moles of oxygen gas are used up as ethane combusts completely, how many moles of carbon dioxide are produced?

a)

0.5 mol CO2

b)

0.57 mol CO2

c)

2.0 mol CO2

d)

3.0 mol CO2

e)

3.5 mol CO2

30.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

How many moles of ethane (C2H6) are required to produce 13.5 moles of water from the above reaction?

a)

4.5 mol C2H6

b)

27 mol C2H6

c)

40.5 mol C2H6

d)

81 mol C2H6

e)

162 mol C2H6

31.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
32.

What is the mole ratio of Mg to MgCl2 ( I have MgCl2, I want Mg)

Mg + 2HCl →\rightarrow  MgCl2 + H2

a)

2  Mg1 MgCl2\frac{2\ \ Mg}{1\ MgCl_2}  

b)

1 Mg2 MgCl2\frac{1\ Mg}{2\ MgCl_2}  

c)

1 Mg1 MgCl2\frac{1\ Mg}{1\ MgCl_2}  

d)

2 Mg2 MgCl2\frac{2\ Mg}{2\ MgCl_2}  

33.

What is the mole ratio of HCl to Mg ( I have Mg, I want HCl)

Mg + 2HCl →\rightarrow  MgCl2 + H2

a)

2  HCl1 Mg\frac{2\ \ HCl}{1\ Mg}  

b)

1 HCl2 Mg\frac{1\ HCl}{2\ Mg_{ }}  

c)

1 HCl1 Mg\frac{1\ HCl}{1\ Mg}  

d)

2 HCl2 Mg\frac{2\ HCl}{2\ Mg}  

34.

If 2.5 moles of HCl were reacted, how many moles of MgCl2 will be produced?

Mg + 2HCl →\rightarrow  MgCl2 + H2

a)

2.5 moles  MgCl2

b)

1.25 moles  MgCl2

c)

5 moles  MgCl2

d)

1 mole MgCl2  

35.

If 2.5 moles of HCl were reacted, how many moles of MgCl2 will be produced?

Mg + 2HCl →\rightarrow  MgCl2 + H2

a)

2.5 moles  MgCl2

b)

1.25 moles  MgCl2

c)

5 moles  MgCl2

d)

1 mole MgCl2  

36.

If 2 moles of Oxygen were reacted, how much water was produced?

C3H8 + 5O2 →\rightarrow  3CO2 + 4H2O

a)

4 moles H2O

b)

  2 moles H2O

c)

 2.5 moles H2O

d)

  1.6 moles H2O

37.

If 6 moles of O2 was used, how many moles of Al2O3 will be produced?

4Al + 3O2 →\rightarrow  2Al2O3

a)

8 moles Al2O3

b)

 6 moles Al2O3

c)

4 moles Al2O3

d)

2 moles Al2O3

38.

If 3.7 moles of Al was used, how many moles of Al2O3 will be produced?

4Al + 3O2 →\rightarrow  2Al2O3

a)

1.85 moles Al2O3

b)

 7.4 moles Al2O3

c)

3.7 moles Al2O3

d)

2.7 moles Al2O3

39.

1 CH4 + 2 O2 → 1 CO2 + 2 H2O

How many moles of carbon dioxide (CO2) are produced from the combustion of 110.0 g of CH4 (molar mass = 16 g)?

a)

13.7 mol

b)

2.75 mol

c)

6.85 mol

d)

6.11 mol

40.

2 Al2O3 → 4 Al + 3 O2

Calculate the moles of aluminum (Al) from 5.00 mol of aluminum oxide (Al2O3).

a)

7.5 mol

b)

10 mol

c)

2.5 mol

d)

4 mol

41.

Balance the following reaction:

_Al2O3 → _Al + _O2

a)

2

b)

4

c)

3

1)
2)
3)
42.

2Na + 2H2O → 2NaOH+ H2 How many grams of hydrogen are produced if 120 g of Na are available?

Hint: Moles of given--> R/G---> mass of H2)

a)

5.2 g

b)

2.6 g

c)

690 g

d)

45 g

43.

2Na + 2H2O → 2NaOH+ H2 How many Liters of hydrogen are produced at STP if 120 g of Na are available?

Hint: Moles of given--> R/G---> volume of H2)

a)

5.2 L

b)

52.8L

c)

11.2 L

d)

336 L

44.

2Na + 2H2O → 2NaOH+ H2 How many molecules of hydrogen gas are produced if 120 g of Na are available?

Hint: Moles of given--> R/G---> molecules of H2

a)

1.6 x 102410^{24}

b)

7.8 x 102310^{23}

c)

1.5 x 102510^{25}

d)

3.6 x 102510^{25}

45.

What is the molarity of a solution containing 4 moles of KCl in 2.5 L of solution?

a)

1.6 M

b)

0.63 M

c)

10 M

d)

2.6 M

46.

What volume is needed to make a 2.45 M solution of KCl using 0.50 mol of KCl?

a)

4.9 L

b)

0.20 L

c)

1.2 L

47.

How many moles of NaCl are needed to make 5.25 L of a 0.25 M solution?

a)

1.3 mol

b)

21 mol

c)

0.048 mol

48.

How many grams of KCl would be dissolved in 5.50 L of a 0.250 M solution of KCl? *molar mass of KCl = 74.55 g/mol*

a)

1.48 g

b)

103 g

c)

1640 g

d)

3.39 g

49.

What is the molarity of a solution made by adding 1.565 moles of PbNO3 to 0.5 L?

a)

300. M

b)

31.3 M

c)

3.13 M

d)

1.56 M

50.

Which solution is more concentrated?

Solution 1:

500 mL of water

100 g of salt


Solution 2:

500 mL of water

90 g of salt

a)

Solution 1

b)

Solution 2

c)

They have the same concentration

d)

I have no idea

51.
What is the molarity of 4 grams of sodium chloride in 3,800 mL of solution?
a)
0.018 M
b)
0.018 mol
c)
1.052 M
d)
1.052 mol
52.
What is the molarity of a solution which contains 22.41 grams of NaCl in 50.0 mL of solution?
a)
0.488 M
b)
7.67 mol
c)
7.67 M
d)
0.00767 M
53.

Molarity is measured in _____.

a)

moles per g.

b)

mols per L.

c)

moles per mm.

d)

moles per mL.

54.
What is the molarity of 2.5 mol of NaOH in 12.0 L of solution?
a)
0.21 M
b)
30 M
c)
4.8 M
d)
20.8 M
55.
How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?
a)
1074 mol
b)
0.069 mol
c)
1.07 mol
d)
62.7 mol
56.
How many moles are needed to make 2.5 L of a 3.8 M solution? 
a)
9.5 mol
b)
0.66 mol
c)
1.5 mol
d)
15 mol
57.

To prepare 1M of NaOH in 1L of solution, you will need a mass of ______g NaOH

a)

23g

b)

40g

c)

4g

d)

39g

58.

0.25 L contains 0.4 mol NaOH. Find its molarity.

a)

0.1M

b)

1.6M

c)

0.4M

d)

0.625M

59.
What is a limiting reactant?
a)
the reactant that determines how much product can be made
b)
the reactant that is in excess
c)
the product that you can make the most of
d)
the amount of reactants that react with each other
60.
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
61.
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
62.
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

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