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What is the mass of 5.36 x 10^21 platinum atoms

1 Answer

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Answer: 1.74g Pt

Step-by-step explanation:

This is a unit conversion problem, and we will be converting from atoms of Pt to mol Pt to g Pt, using Avogadro's constant (6.022 x 10²³ atoms/mol) and platinum's molecular weight (195.1g Pt/1 mol Pt).

I wrote it two different ways in case the fractions were a bit difficult to read. :)

5.36 x 10²¹ Pt atoms (
(1 mol Pt)/(6.022*10^(23) Pt atoms))(
(195.1g Pt)/(1 mol Pt)) = 1.74g Pt

5.36 x 10²¹ Pt atoms (1 mol Pt/6.022 x 10²³ Pt atoms)(195.1g Pt/1 mol Pt) = 1.74g Pt

Our given value has three significant figures (5.36, so the 10²¹ doesn't count), so our final answer will have three significant figures as well.

I hope this helps! :)

User Xian
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