Question

What is the mass of 1.7 × 1023 atoms of zinc (Zn)?

Answer 1

1 mol Zn 65.41 g Zn
1.7 x10^23 atoms Zn x --------------- x ------------- = 18.47 g Zn
6.022 x 10^23 atoms 1 mol Zn

Answer 2

Answer : The mass of zinc is 18.3 grams.

Explanation :

First we have to calculate the moles of zinc.

As,
`6.022* 10^(23)` number of zinc atoms present in 1 mole of zinc

So,
`1.7* 10^(23)` number of zinc atoms present in
`(1.7* 10^(23))/(6.022* 10^(23))=0.28` mole of zinc

Now we have to calculate the mass of zinc.

Molar mass of zinc = 65.4 g/mole

`\text{Mass of }Zn=\text{Moles of }Zn* \text{Molar mass of }Zn`

`\text{Mass of }Zn=0.28mole* 65.4g/mole=18.3g`

Therefore, the mass of zinc is 18.3 grams.