Weight of 56 litres of ammonia at N.T.P. is _____________ gm?
Correct answer: B. 42.5
- A. 2.5
- B. 42.5
- C. 56
- D. 2800
Explanation
At N.T.P., one gram-mole of an ideal gas occupies 22.4 L, so 56 L represents 2.5 moles. Ammonia has molar mass 17 g/mol, giving 2.5 × 17 = 42.5 g.
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