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30 October, 10:40

Calculate the number of oxygen atoms in 15.0g of calcium nitrate

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  1. 30 October, 10:51
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    1 mol Ca (NO3) 2 has 6 O atoms and the mass of Ca (NO3) 2 is 164 g/mol.

    1 mol has 164 g

    X moles has 15g

    X = 0.0915 mol Ca (NO3) 2

    0.0915 x (6 O / 1 mol Ca (NO3) 2) = 0.549 mol O atoms

    0.549 mol O x (6.02 x 10^23) = 3.30 x 10^23 atoms of O
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