Question

$4.6\times {10}^{22}$ atoms of an element weighs 13.8 g. The atomic mass of the element is:

• A. 290
• B. 180
• C. 34.4
• D. 10.4

Answer 1

The correct option is B 180

$4.6\times {10}^{22}$ atoms of an element weighs 13.8 g

$6.022\times {10}^{23}$ atoms of an element will weigh = $\frac{(13.8\times 6.022\times {10}^{23})}{4.6\times {10}^{22}}=180$