   Chapter 10, Problem 29P

Chapter
Section
Textbook Problem

A sample of pure copper has a mass of 12.5 g. Calculate the number of (a) moles in the sample and (b) copper atoms in the sample.

(a)

To determine
The number of moles in the sample.

Explanation

Given Info: Mass of pure copper (m) is 12.5 g. The molar mass of copper ( MCu ) is 63.546 g/mol.

Formula to calculate the number of moles in the sample is,

n=mMCu

Substitute 12.5 g for m and 63.546 g/mol for MCu to get n

(b)

To determine
The number of copper atoms in the sample.

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