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What is the mass of #4*10^21# platinum atoms?

Answer 1

Jeremiah Adams

The mass of #4xx10^21# atoms Pt is#" ~~# 1 g Pt.

To respond to this question, two equalities are needed.

#6.022xx10^23 "atoms"##=##1"mol atoms"#

#1"mol Pt"##=##195.084"g Pt"# (molar mass of Pt)

Next, perform the subsequent actions.

Pt's molar mass is multiplied by the given number of Pt atoms divided by the number of Pt atoms in a mole.

#4xx10^21cancel"atoms Pt"xx(1cancel"mol Pt")/(6.022xx10^23cancel"atoms Pt")xx(195.084"g Pt")/(1cancel"mol Pt")="1 g Pt"# (rounded to one significant figure)

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Answer 2

Luna Chen

4*10^21 platinum atoms have a mass of about 1.34 grams.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.