Question

Calculate the number of gram atoms in $4.6\text{grams}$ of sodium $\left(\mathrm{Na}=23\right)$

Answer 1

Step 1. Given information

• $4.6\text{g}$ of sodium $\left(\text{Na}\right)$

Step 2. Atomic mass

• The gram atomic mass is the amount of an element whose mass represented in grams is numerically equivalent to its atomic mass.
• One gram atom is the gram atomic mass of an element.

Step 3. Calculation of gram atoms in $4.6\text{grams}$ of sodium

• The gram atomic mass of sodium is $\text{23 g}$. Therefore, it can be written as follows

$23\text{g of sodium=1 gram atom}$

• For $4.6\text{grams}$ sodium, the gram atoms are calculated as follows

$4.6\text{g of sodium=}\frac{1\mathrm{gram}\mathrm{atom}}{23\text{g}}\text{×4.6 g=0.2 gram atom}$

Hence, the number of gram atoms in $4.6\text{g}$ of sodium is $0.2\text{g atoms}$.