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Q.
Amount of $ CO_{2} $ in expired air is about
J & K CETJ & K CET 2011Breathing and Exchange of Gases
Solution:
Amount of $ CO_{2} $ in expired air is $4.4\%$. The air we breathe in contain about $0.04\% CO_{2} $ . The air we breathe out contains about $4\% CO_{2} $ . In other words, exhaled air contains about $100$ times the concentration of $ CO_{2} $ that inhaled air does.