JEE Main Chemistry question
96 g of Mg is burnt in air in a closed chamber. On analysis 25% of Mg is converted into oxide and remaining Mg into other possible product. Residue is dissolving in and neutralized by . Number of moles of required is
Answer: 5
Solution
Moles of Mg taken . Air also contains , so the "other possible product" is magnesium nitride. 25% of Mg (1 mole) forms MgO; the remaining 75% (3 moles) forms (3 mol Mg 1 mol , since 3 Mg per formula unit). On dissolving in water: (1 mol), and
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