Show by an experiment that `CO_2` in present in the exhaled air.

CO_(2) gas is present in :

The bell jar experiment shows that

Some older emergency oxygen masks contains potassium superoxide KO_2 which reacts with CO_2 and water present in exhaled air to produce oxygen according to the given equation. If a person exhales 0.667 g of CO_2 per minute, how many gram of KO_2 are consumed in 5.0 minutes ?

Which of the following experiments showed that CO_(2) is essential for photosynthesis?

Moll's experiment show