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8 July, 01:34

What is the mass of 5.33*1021 platinum atoms

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  1. 8 July, 01:44
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    To find mass of a bunch of atoms, we first have to convert to moles (using Avogadro's number), then the atomic mass (from the periodic table):

    5.33 x10^21 atoms Pt x (1 mole/6.022x10^23 atoms) x (195.08 grams Pt/1 mole)

    = 1.73 grams of Pt

    Notice the answer has three digits - three significant figures since the 5.33 has three sig figs - the fewest of all the values in the problem.
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