State the volume occupied by 40 gm of methane at STP, if its vapour density (V.D.) is 8

Explanation

To find the volume occupied by 40 grams of methane (CH₄) at Standard Temperature and Pressure (STP), we can follow these steps:

### Step 1: Determine the Molar Mass of Methane
The molar mass of methane (CH₄) can be calculated as follows:
- Carbon (C) has a molar mass of approximately 12 g/mol.
- Hydrogen (H) has a molar mass of approximately 1 g/mol, and there are 4 hydrogen atoms in methane.

So, the molar mass of methane is:
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