Question

$3.011\times {10}^{22}$ atoms of an element weighs 1.15 gm. The atomic mass of the element is:

• A. 23
• B. 10
• C. 16
• D. 35.5

Answer 1

Answer: (A)

23

$3.011\times {10}^{22}$ atoms of an element weighs 1.15 gm.

$6.023\times {10}^{23}$ atoms of an element will weigh $1.15\times \frac{6.023\times {10}^{23}}{3.011\times {10}^{22}}=23$ gm.

The atomic mass of the element is 23 g/mol.