In a lab, a student is given a $21 \mathrm{~g}$ sample of pure Cu metal. Which of the following pieces of information is most useful for determining the number of $\mathrm{Cu}$ atoms in the sample? Assume that the pressure and temperature in the lab are $1.0 \mathrm{~atm}$ and $25^{\circ} \mathrm{C}$.
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The volume of the Cu sample
The ratio of the two main isotopes found in pure $\mathrm{Cu}$
The molar mass of $\mathrm{Cu}$
The density of $\mathrm{Cu}$ at $25^{\circ} \mathrm{C}$

Question

Accepted Answer

Hello! It looks like you have a question about determining the number of atoms in a sample of pure Cu metal. The most useful piece of information for this calculation is the molar mass of Cu. This information will help you convert the mass of the sample into the number of atoms present. If you have any more questions or need further clarification, feel free to ask!

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