# Question 69a62

Mar 17, 2017

Beaker $\text{A}$.

#### Explanation:

You know that you must compare masses, so the only thing to do here is to convert the number of moles of copper to grams by using the element's molar mass.

Copper has a molar mass of

${M}_{\text{M Cu" = "63.546 g mol}}^{- 1}$

This means that every mole of copper has a mass of $\text{63.546 g}$. You can thus say that the sample of copper present in beaker $\text{A}$ will have a mass of

5.06 color(red)(cancel(color(black)("moles Cu"))) * "63.546 g"/(1color(red)(cancel(color(black)("mole Cu")))) = "321.5 g"#

Therefore, the sample of copper present in beaker $\text{A}$ will have a greater mass than the $\text{222-g}$ sample of silver present in beaker $\text{B}$.

$\text{321.5 g Cu " > " 222 g Ag}$