Question

$4.6\times {10}^{22}$ atoms of an element weigh $13.8g$. The atomic weight of that element is

• A. 290
• B. 180
• C. 34.4
• D. 10.4

Answer 1

Answer: (B)

$4.6\times 10^{22}$ atoms weigh $=13.8g$
Hence,
$6.02\times 10^{13}$ atoms will weigh
$=\frac{13.8\times 6.02\times 10^{23}}{4.6\times 10^{22}}$
$=180.6g$ (molar mass)