Stoichiometry Q & A

1-10. For the given combustion reaction

a CH4 + b O2 → c CO2 + d H2O

1. What is the value of a?

a) 1

b) 4

c) 5

d) 6.5

2. What is the value of b?

a) 1

b) 2

c) 3

d) 4

3. What is the value of c?

a) 1

b) 4

c) 5

d) 6.5

4. What is the value of d?

a) 1

b) 2

c) 5

d) 6

Answer: b

Explanation: Carbon and Oxygen on both the sides.

5. For producing 10 moles of H2O, how many moles of CH4 are required? (Consider O2 is in excess)

a) 1

b) 2

c) 5

d) 10

Answer: c

Explanation: 1 mole of CH4 is equivalent to 2 moles of H2O.

6. How many moles of O2 are required for producing 10 moles of H2O? (Consider C4H10 is in excess)

a) 10

b) 20

c) 25

d) 30

Answer: a

Explanation: 1 mole of O2 is equivalent to 1 moles of H2O.

7. How much CO2 in kg can be produced with 1 mole of CH4? (Consider O2 is in excess)

a) 44

b) 88

c) 132

d) 176

Answer: a

Explanation: 1 mole of CH4 is equivalent to 1 moles of CO2.

8. How much CO2 in kg can be produced with 1 mole of O2? (Consider C4H10 is in excess)

a) 22

b) 88

c) 132

d) 176

Answer: a

Explanation: 2 moles of O2 is equivalent to 1 moles of CO2.

9. For producing 36 gms of water in the reaction, how many moles of CH4 are required?

a) 1

b) 2

c) 3

d) 4

Answer: a

Explanation: 1 mole of CH4 is equivalent to 2 moles (36 gms) of H2O.

10. For producing 90 gms of water in the reaction, how many moles of O2 are required?

a) 5

b) 10

c) 15

d) 20

Answer: 5

Explanation: 1 moles of O2 is equivalent to 1 moles of H2O.