A certain amount of a divalent metal reacts with excess dilute nitric acid to produce 4.48 liters of nitrogen monoxide gas at STP. If 19.2 grams of the metal was consumed, identify the metal.
- Cu
- Mg
- Fe
- Zn
📝 Detailed explanation
Reaction: 3M + 8HNO₃ → 3M(NO₃)₂ + 2NO + 4H₂O.Moles of NO = 4.48 / 22.4 = 0.2 mol.
Molar ratio M : NO is 3 : 2.
Moles of Metal = 0.2 × (3 / 2) = 0.3 mol.
Molar mass M = mass / moles = 19.2 / 0.3 = 64 g/mol.
The metal is Copper.