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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
Result
Your answer:
—
·
Correct:
B
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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