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4 September, 19:30

How many total atoms are in 0.170 g of p2o5?

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  1. 4 September, 19:32
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    7.20594 x 10^20

    First you must determine how many moles of P3O5 you have. This is done by using the formula

    Number of moles (n) = mass in grams of substance (m) / divided by / Molar mass (M) [this is the sum of the atomic mass of all atoms in the compound]

    n = 0.170 / P (31 x 2) + O (16 x 5)

    n = 0.170 / 142

    n = 0.001197 moles

    Then you use avagadros number 6.02 x10^23 this is the number of atoms in one mole of any substance. Since you have 0.001197 moles you multiply the number of moles by avagadros number

    0.001197 x (6.02 x 10^23)

    = 7.20594 x 10^20 atoms
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