Question

A modern-day nickel is 25% nickel and 75% copper. Every nickel weighs exactly five grams. Using this information, how many nickel coins do you need to have before you have a mole of nickel?

Answer 1

• 47 coins

Step-by-step explanation:

The atomic mass of nickel is 58.963g/mol. Thus, one mole of nickel weighs "exactly" 58.693g.

How much nickel does every coin contain?

`25\%\text{ of }5g=0.25* 5g=1.25g\text{ of nickel per coin}`

How many times 58.693g contains 1.25g?

`(58.693g)/(1.25g/coin)=46.95\approx47coins`

That means that you need to have 47 coins of nickel to have one mole of nickel.