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1 mole H2 = 2.016g H2 = 6.022 x 1023 molecules H2

10g H2 x 1mol H2/2.016g H2 x 6.022 x 1023 molecules H2/1mol H2 = 3 x 1024 molecules H2 (rounded to 1 significant figure)

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Q: How many hudrogen molecule are there in 10grams of hydrogen?
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