Question

73. Some older emergency oxygen masks containing potassium superoxide, KO2 which reacts
with CO2 and water in exhaled air to produce oxygen according to the given equation. If a
person exhales 0.667 g of CO2 per minute, how many grams of KO2 are consumed in 5.0
minutes?
4KO2 + 2H,0 + 4CO2 - 4KHCO3 + 302
(a) 10.7
(b) 0.0757
(c) 1.07
(d) 5.38
​

Answer 1

Given:

Chemical Reaction:-

4KO2 + 2H2O + 4CO2 ----> 4KHCO3 + 3O2

Amount of CO2 exhaled by a person per minute = 0.667 g

Total time = 5 minute

To Find:

Amount of KO2 consumed in 5 minutes.

Calculation:

- Amount of CO2 exhaled in 5 minutes = 0.667 × 5 = 3.335 g

- According to the given reaction:

Amount of KO2 consumed by 176 g CO2 = 284 g

⇒ Amount of KO2 consumed by 3.335 g CO2 = (284/176) × 3.335

⇒ Amount of KO2 consumed by 3.335 g CO2 = 5.38 g

- So the correct answer is option (d) 5.38 g