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Question

Calculate the number of moles of H2 in a sample containing 3.011×103 H2 molecules.


A
5×1021
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B
5×1021
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C
2×1020
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D
2×1020
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Solution

The correct option is B 5×1021
Number of moles=Number of moleculesAvogadro number
=3.011×103molecules6.022×1023molecules/mol
=5×1021 moles

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