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28 September, 18:05

What is the mass of platinum that has 4.34x10^21 of atoms?

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  1. 28 September, 18:30
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    Answer is: the mass of platinum is 1.405 grams.

    N (Pt) = 4,34·10²¹.

    n (Pt) = N (Pt) : Na.

    n (Pt) = 4,34·10²¹ : 6,022·10²³ 1/mol.

    n (Pt) = 0,0072 mol.

    m (Pt) = n (Pt) · M (Pt).

    m (Pt) = 0,0072 mol · 195 g/mol.

    m (Pt) = 1,405 g.

    n - amount of substance.

    Na - Avogadro number.
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