Amount of `CO_(2)` in expired air is about

Options

A. 0.0004
B. 0.0003
C. 0.045
D. 0.021

Answer

C

Explanation

Amount of `CO_(2)` in expired air is 4.5 % . The air we breathe in contains about 0.05% `CO_(2)`. The air we beathe out contains about 4% `CO_(2)`. In other word, exhalled air contais about 100 times the concentration of `CO_(2)` that inhaled air does.