
Interpretation: The number of molecules in a breath of air needs to be determined.
Concept introduction: If two gases have same temperature, pressure and volume then the gases have same number of gas particles independent of the identity of the gas.

Answer to Problem C12.1RE
The number of molecules in a breath of air is
Explanation of Solution
Ideal gas equation is as follows:
PV = nRT
Here, P is pressure, V is volume, n is number of mole, R is gas constant and T is temperature.
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