A 2-valent metal carbonate and hydroxide mixture in a 5:2 molar ratio loses 47.7% of its mass upon heating; determine the metal.
- Mg
- Fe
- Cu
- Al
📝 Detailed explanation
5 MCO₃ + 2 M(OH)₂ → 7 MO + 5 CO₂ + 2 H₂OMass loss = (5 × 44 + 2 × 18) / (5 × (M + 60) + 2 × (M + 34)) = 0.477.
256 / (7M + 368) = 0.477.
7M + 368 = 536.6.
7M = 168.6, M = 24.
Metal is Magnesium.