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

The mass of iron required to produce 3 moles of hydrogen gas by reacting with steam according to 3Fe + 4H₂O → Fe₃O₄ + 4H₂ is

A. 56 g
B. 84 g
C. 126 g
✓
D. 168 g

📝 Explanation

Fe:H₂ = 3:4. For 3 moles H₂, Fe = 2.25 moles. Mass = 2.25 × 56 = 126 g.

📖 Additional Information

  • 56 g
  • 84 g
  • 126 g
  • 168 g

Fe:H₂ = 3:4. For 3 moles H₂, Fe = 2.25 moles. Mass = 2.25 × 56 = 126 g.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

A gas has a density of 1.964 g/dm³ at STP. The molar mass of this gas is approximately

Next Question

The number of moles of water of crystallization in 143.5 g of washing soda (Na₂CO₃·10H₂O) is

Back to All Questions

🔗 Related MCQs

Among the following statements, the most appropriate explanation for expressing chemical amounts in moles is
July 13, 2026
Regarding representative particles, one mole of calcium ions contains
July 13, 2026
During the reaction N₂ + 3H₂ → 2NH₃, complete reaction of 44.8 L of nitrogen gas at STP produces
July 13, 2026
Under standard conditions, 89.6 L of oxygen gas corresponds to
July 13, 2026
Regarding the balanced equation 2K + 2H₂O → 2KOH + H₂, complete reaction of 8 moles of potassium produces
July 13, 2026

Categories

View all →