Answer:
3.78 x 10^24
Explanation:
I mol = 6.02X10^23 atoms
So,
[tex]6.28 mol A l \frac{6.022 x 10^{23}}{1 mol} = 3.78 x 10^{24}[/tex] I did not round the last number
the full answer was, 3.78056 x 10^24
