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Q60
(NDA-II/2024)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Official Key
The mass of 0.5 mole of N2 gas is
Explanation
To determine the mass of 0.5 mole of N2 gas, we use the fundamental concept of molar mass from chemistry.
- Atomic mass of Nitrogen (N): The atomic mass of a single nitrogen atom is approximately 14 u.
- Molecular mass of N2: Nitrogen gas exists as a diatomic molecule (N2). Therefore, its molecular mass is 2 × 14 = 28 u.
- Molar mass: The molar mass of N2 is 28 g/mol, meaning one mole of nitrogen gas weighs 28 grams.
The mass of a substance can be calculated using the formula:
Mass = Number of moles × Molar mass
Applying the values from the question:
Mass = 0.5 mol × 28 g/mol = 14 g.
Thus, the mass of 0.5 mole of N2 gas is 14 g, which aligns with Option B.
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