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Question: 1
2 grams of H2 , 16g of CH4 and 44g of CO2 , occupy separately the volumes of 22.414 dm2 at STP although the sizes and masses of molecules of three gases are very different from each other.
Answer: 1
1-21
One mole of an ideal gas at S.T.P. occupies a volume of 22.414 dm3. Sizes and masses of molecules of different gases do not affect the volume. Normally it is known that in the gaseous state, the distance between the molecules is 300 times greater than their diameter. Therefore two grams of H2 , 16g of CH4 and 44g of CO2 (1 mole of each gas) separately occupy a volume of 22.4 dm3. This is called molar volume (Vm).