Question

What is the mass of 2.18 mol of Cu?

Please show me the solution. Thank you very much!

Answer 1

Approximately `138.53` grams.

Explanation:

We have to use the molar mass formula, which states that,

`n=m/M`

• `m` is the mass of substance

• `M` is the molar mass of substance

• `n` is the number of moles of substance

Rearranging for mass, we get:

`m=n*M`

Copper has a molar mass of `63.546 \ "g/mol"`. So here, the mass of this sample will be,

`m=2.18color(red)cancelcolor(black)"mol"*(63.546 \ "g")/(color(red)cancelcolor(black)"mol")~~138.53 \ "g"`