A analysis of a pyrex glass showed `12.9% B_(2)O_(3), 2.2% Al_(2)O_(3),3.8%Na_(2)O,0.4%K_(2)O` and remaining is `SiO_(2)`. What is the ratio of Si to B atoms in the glass ? (At. Masses : Si = 28, B = 11, Al = 27, Na = 23, K = 39)

Explanation

To find the ratio of silicon (Si) to boron (B) atoms in the given Pyrex glass composition, we will follow these steps:

### Step 1: Determine the mass of SiO₂
Given the composition of the glass:
- B₂O₃: 12.9%
- Al₂O₃: 2.2%
- Na₂O: 3.8%
- K₂O: 0.4%
...