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Chemistry NMDCAT MCQs Moles and Avogadro's Numbers
nmdcat.online July 2, 2026

A sample of a pure gas has a mass of 1.25 g and occupies a volume of 1 dm³ at STP. The molar mass of this gas is

A. 14 g/mol
B. 28 g/mol
✓
C. 32 g/mol
D. 44 g/mol

📝 Explanation

Moles = 1 ÷ 22.4 = 0.0446 mol. Molar mass = 1.25 ÷ 0.0446 ≈ 28 g/mol.

📖 Additional Information

  • 14 g/mol
  • 28 g/mol
  • 32 g/mol
  • 44 g/mol

Moles = 1 ÷ 22.4 = 0.0446 mol. Molar mass = 1.25 ÷ 0.0446 ≈ 28 g/mol.

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