Question

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

• A. $23$ amu
• B. $10$ amu
• C. $16$ amu
• D. $35.5$ amu

Answer 1

The correct option is A $23$ amu

$3.011\times {10}^{22}$ atoms of an element weights $1.15$ g.

$3.011\times {10}^{22}=1.15g$

$6.023\times {10}^{23}=x$?

$\therefore x=\frac{1.15}{3.011\times {10}^{22}}\times 6.023\times {10}^{23}=23$ amu