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17 January, 15:17

How many atoms are in a sample of 72.8 grams calcium?

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  1. 17 January, 17:11
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    First find the moles

    moles of the calcium = 72.8 / 40

    moles of calcium in 72.8g = 1.82mol

    number of atoms = moles x Avogadro constant

    atoms = 1.82 x 6.02x10+23

    so the number of atoms is 1.096x10+24
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