Question

The number of sulphur atoms in 0.1 mol of $S_8$ is .

• A. $0.8\times 6.022\times {10}^{23}$
• B. $6.022\times {10}^{23}$
• C. 0.8
• D. $0.1\times 6.022\times {10}^{23}$

Answer 1

The correct option is A $0.8\times 6.022\times {10}^{23}$

1 mole of $S_8$ = $6.022\times {10}^{23}$ molecules

0.1 mole of $S_8$ = $6.022\times {10}^{23}\times 0.1=6.022\times {10}^{22}$ molecules

1 molecule of $S_8$ has 8 atoms of sulphur.

$6.022\times {10}^{23}\times 0.1$ molecules of $S_8$ has $8\times 6.022\times {10}^{23}\times 0.1$ atoms of $S$ = 48.176 $\times {10}^{22}$ atoms