What is the percentage composition of `Na_(2)S_(2)O_(3).5H_(2)O` ?

Explanation

To find the percentage composition of \( \text{Na}_2\text{S}_2\text{O}_3 \cdot 5\text{H}_2\text{O} \), we will follow these steps:

### Step 1: Calculate the molar mass of the compound
The molar mass is calculated by summing the atomic masses of all the atoms in the formula.

1. **Sodium (Na)**: There are 2 sodium atoms.
\[
2 \times 23 \, \text{g/mol} = 46 \, \text{g/mol}
...