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1 March, 10:13

How many total atoms are in 0.510 g of p2o5?

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  1. 1 March, 10:31
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    First, we need to calculate the moles of P2O5:

    moles of P2O5 = mass of P2O5 / Molar mass of P2O5

    when the molar mass = 2*31 + 5*16 = 142 g/mol

    by substitution:

    moles of P2O5 = 0.51 g / 142 g/mol

    = 0.0036 moles

    to know how many molecules = moles P2O5 * Avogadro's number

    = 0.0036 * 6.02 x 10^23

    = 2.17 x 10^21 molecules P2O5

    when each molecule of P2O5 has 2 P atoms and 5 O atoms = 7 atoms

    ∴ the total atoms = 2.17 x 10^21 * 7atoms = 1.5 x 10^22 atoms
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