A cylinder contains 32 g of methane gas at S.T.P. How many molecules of ammonia are present in the cylinder ? [C-12, H-1]

Explanation

To solve the problem of how many molecules of methane (CH₄) are present in a cylinder containing 32 g of methane gas at standard temperature and pressure (S.T.P.), we can follow these steps:

### Step 1: Calculate the Molar Mass of Methane (CH₄)
The molar mass of methane can be calculated by adding the atomic masses of its constituent elements:
- Carbon (C): 12 g/mol
- Hydrogen (H): 1 g/mol (and there are 4 hydrogen atoms in methane)

So, the molar mass of CH₄ is:
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