Calculate the percentage of boron (B) in borax, `Na_(2)B_(4)O_(7). 10H_(2)O`.
(H = 1, B = 11, O = 16, Na = 23)

Explanation

To calculate the percentage of boron (B) in borax, represented by the formula \( \text{Na}_2\text{B}_4\text{O}_7 \cdot 10\text{H}_2\text{O} \), we will follow these steps:

### Step 1: Calculate the molar mass of borax
We need to find the molar mass of each component in the formula and then sum them up.

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