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Q.

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
$(At . wt . Mg = 24; 0 = 16)$

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a

$Mg .0.44 g$

b

$O_{2}, 0 .28 g$

c

$Mg, 0 .16 g$

d

$O_{2}, 0 .16 g$

answer is C.

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Detailed Solution

$24 g .$ $Mg$ requires $16 g$ oxygen

$∴ 0.56 g$ oxygen requires $0.84 g Mg$

$∴ Mg$ left $= 0 .16 g$

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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; 0 = 16)