1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which r

1.	1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much?(At wt. Mg = 24; O = 16)(A) Mg, 0.16 g (B) O2, 0.16 g (C) Mg, 0.44 g (D) O2, 0.28 g
Answer» Correct option: (A) Mg, 0.16 g 2Mg + O₂ → MgO (2x24) (32) 48 g of Mg requires 32 g of O₂ ∴ 0.56 g of O₂ requires = \(\cfrac{0.56\, \times\, 48}{32}\) = 0.84 g of Mg ∴ Mg left = 1 - 0.84 = 0.16 g

1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much?(At wt. Mg = 24; O = 16)(A) Mg, 0.16 g (B) O2, 0.16 g (C) Mg, 0.44 g (D) O2, 0.28 g

Answer»

Correct option: (A) Mg, 0.16 g

2Mg + O₂ → MgO

(2x24) (32)

48 g of Mg requires 32 g of O₂

∴ 0.56 g of O₂ requires = \(\cfrac{0.56\, \times\, 48}{32}\)

= 0.84 g of Mg

∴ Mg left = 1 - 0.84 = 0.16 g