What is the percentage of sulphur in ultramarine ?

Explanation

To find the percentage of sulfur in ultramarine, we need to follow these steps:

### Step 1: Understand the Composition of Ultramarine
Ultramarine is a complex aluminosilicate mineral that contains polysulfide groups. The general formula for ultramarine can be represented as Na8(AlSiO4)6(Sx), where Sx indicates the presence of sulfur in the form of polysulfide groups.

### Step 2: Identify the Molar Mass of the Components
To calculate the percentage of sulfur, we need to know the molar mass of the components involved:
- Sodium (Na): 22.99 g/mol
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