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Question

Which of the following contains maximum number of molecules?

A
1 gm of CO2
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B
1 gm of N2
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C
1 gm of H2
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D
1 gm of CH4
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Solution

The correct option is C 1 gm of H2
The mass is same for all the four gases.
The gas having lowest molar mass will have maximum number of moles and maximum number of molecules.
The molar masses of CO2,N2,H2andCH4 are 44 g/mol, 28 g/mol , 2 g/mol and 16 g/mol respectively.
Thus, the molar mass of hydrogen is minimum.
Thus, 1 g of H2 will have maximum number of molecules.

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