A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction:

Notice that the reaction produces , which can be breathed, and absorbs , a product of respiration. Suppose you work for a company interested in producing a self-rescue breathing apparatus (based on the above reaction) which would allow the user to survive for 14 minutes in an emergency situation.

Estimate how much would be required for the apparatus. (Find any necessary additional information. Assume that normal air is 20% oxygen and human breathing rate is about 8 . Assume that 4% of the air would need to be replenished with oxygen)