Question

Calculate the weight of 0.25 gram atom of calcium.

Answer 1

Number of gram atoms = $\frac{Givenmassofatom}{Atomicmassofanatom}$

Number of gram atoms of Calcium = $\frac{Givenmassofcalcium}{Atomicmassofcalcium}$

Number of gram atoms of Calcium = 0.25g

Atomic mass of Calcium = 40 g

$\therefore$Given mass of Calcium = Number of gram atoms of $\mathrm{Ca}$ $\times$Atomic mass of $\mathrm{Ca}$

$$\begin{gathered} =0.25\times 40 \\ =10g \end{gathered}$$

Therefore, Atomic weight of Calcium is 10 g.