[هدير جهاد]

physical chemistry

Aperson takes 15breaths/min. The amount of air inhaled in each breathis about450ml and contains21% O2 by volume while the exhaled air 450ml contains16.1%O2 by volum. pressure of atmosphereis 1atm at 25 C .Thus the numberof moles of O2 taken in the body per day is:
a-39mol b-19.49mol c-9.75mol d-11.2mol