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For this you need the atomic (molecular) mass of H2. Take the number of moles and multiply it by the Atomic Mass. Divide by one mole for units to cancel.

3.00 moles H2 × 2.02 = 6.06 grams H2

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15y ago
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15y ago

3 moles of Helium would have a mass of 12g

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11y ago

1 mole has 6.023 x 1023 atoms.

So 3 moles have 3 x 6.023 x 1023 atoms

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8y ago

3 moles of helium are equivalent to 12 g.

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