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

For the combustion of ethane, 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O, the mass of water produced from the complete combustion of 30 g of ethane is

A. 18 g
B. 36 g
C. 54 g
✓
D. 108 g

📝 Explanation

30 g of C₂H₆ = 1 mole. One mole of C₂H₆ produces 3 moles of H₂O. Mass of water = 3 × 18 = 54 g.

📖 Additional Information

  • 18 g
  • 36 g
  • 54 g
  • 108 g

30 g of C₂H₆ = 1 mole. One mole of C₂H₆ produces 3 moles of H₂O. Mass of water = 3 × 18 = 54 g.

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