1.0 g of magnesium is burnt with 0.56 g O 2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24; O = 16)

Question

1.0 g of magnesium is burnt with 0.56 g O 2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24; O = 16), O 2 , 0.28 g, O 2 , 0.16 g, Mg, 0.16 g, Mg, 0.44 g

MARKS App · Accepted Answer

n M g = w e i g h t a t o m i c w e i g h t = 1 24 m o l e , n O 2 = 0.56 32 m o l e ∴ mass of M g = 0.0066 × 24 g = 0.16 g O 2 is Limiting reagent M g is excess of reagent

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