We have two vessels of equal volume, one filled with hydrogen and the other with an equal mass of Hellum. The common temperature is $27^{\circ} C$ . What is the relative number of molecules in the two vessels?

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Solution

The masses of hydrogen and helium gases in the vessels are equal. This means that the product of the number of molecules and the mass of a molecule must be same for $H_{2}$ and $H e$ gases. Since molecular masses of $H_{2}$ and $H e$ are in the ratio $1 : 2$ , their number of molecules $n_{H}$ and $n_{H e}$ in the vessels must be in the reverse ratio, that is, $\frac{n_{H}}{n_{H e}} = \frac{2}{1}$ .

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We have two vessels of equal volume, one filled with hydrogen and the other with an equal mass of Hellum. The common temperature is 27∘C. What is the relative number of molecules in the two vessels?

We have two vessels of equal volume, one filled with hydrogen and the other with an equal mass of Hellum. The common temperature is $27^{\circ} C$ . What is the relative number of molecules in the two vessels?