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, $6.022\times 10^{23}$ number of zinc atoms present in 1 mole of zinc

So, $1.7\times 10^{23}$ number of zinc atoms present in $\frac{1.7\times 10^{23}}{6.022\times 10^{23}}=0.28$ mole of zinc

Now we have to calculate the mass of zinc.

Molar mass of zinc = 65.4 g/mole

$\text{Mass of }Zn=\text{Moles of }Zn\times \text{Molar mass of }Zn$

$\text{Mass of }Zn=0.28mole\times 65.4g/mole=18.3g$

Therefore, the mass of zinc is 18.3 grams.