Question

The number of gram atoms in $6.4\text{g}$ of $Ca$ is:

• A. $3.2\text{g}$ atoms
• B. $0.16\text{g}$ atoms
• C. $0.8\text{g}$ atoms
• D. $1.0\text{g}$ atoms

Answer 1

The correct option is B $0.16\text{g}$ atoms

$\text{Number of gram atoms}=\frac{\text{given mass}}{\text{molar mass}}=\frac{6.4}{40}=0.16\text{g atoms}$