Calculate the number of gram atoms in
(i) 640 g of sulphur
(ii) 360 g of magnesium.

Explanation

To solve the question of calculating the number of gram atoms in (i) 640 g of sulphur and (ii) 360 g of magnesium, we will use the concept of moles, which is also referred to as gram atoms. The formula to calculate the number of moles (or gram atoms) is:

\[ \text{Number of moles} = \frac{\text{Given mass (g)}}{\text{Atomic mass (g/mol)}} \]

### Step-by-Step Solution:

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