How many grams of water are required to react with 14 g of calcium carbide to produce acetylene gas?
- 3.6 g
- 7.87 g
- 18 g
- 9 g
📝 Batafsil tushuntirish
CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂.Moles CaC₂ = 14 / 64 = 0.21875 mol.
Moles H₂O needed = 0.21875 × 2 = 0.4375 mol.
Mass H₂O = 0.4375 × 18 = 7.875 g.