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  4. A mixture of gas contains 8 g of oxygen and 7 g of nitrogen. To use the equation PV = nRT, the value of n of such mixture will be:

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Q. A mixture of gas contains $8\,g$ of oxygen and $7\,g$ of nitrogen. To use the equation $PV = nRT$, the value of n of such mixture will be:

Bihar CECEBihar CECE 2001Kinetic Theory

Solution:

Number of moles of oxygen $ =\frac{8}{32}=\frac{1}{4} $
Number of moles of nitrogen $ =\frac{7}{28}=\frac{1}{4} $
Therefore, total number of moles in mixture of two gases,
$ n=\frac{1}{4}+\frac{1}{4}=\frac{1}{2} $