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Question

A sample has 0.1 moles of H2 gas. If 3.011×1023 molecules are added to it, what is the final number of moles of H2 in the sample?

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Solution

Number of moles=Number of moleculesAvogadro number
=3.011×10236.022×1023 molecules/mol
=0.5 moles
Total number of moles of H2=0.1+0.5=0.6 moles

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