Q.

1.0 g of Mg is burnt with 0.56 g O2  in a closed vessel.  Which reactant is left in excess and how much?

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a

Mg; 0.44 g

b

O2 ; 0.28 g

c

Mg; 0.16 g

d

O2 ;16 g

answer is C.

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Detailed Solution

24 g Magnesium requires 16 g of oxygen  0.56 g oxygen requires 0.84 g magnesium As 1g of Mg is taken, weight of magnesium left unreacted = 1 – 0.84 = 0.16g
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