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Question

The maximum number of molecules is present in:

A
15 L of H2 gas at STP
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B
5 L of N2 gas at STP
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C
0.5 g of H2 gas
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D
10 g of O2 gas
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Solution

The correct option is A 15 L of H2 gas at STP
22.4 L of any gas at STP = 6.02×1023 molecule
15 L of H2=6.023×102322.4×15=4.03×1023
5 L of N2=6.023×102322.4×5=1.344×1023
2 g of H2=6.02×1023 molecules
0.5 g of H2=6.02×10232×0.5=1.505×1023
32 g of O2=6.02×1023 molecule
10 g of O2=6.02×102332×10=1.88×1023 molecules

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