1.0 g of magnesium is burnt with 0.56 g in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24, O = 16) [2014]

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Solution

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, O = 16) [2014]

1 Mg, 0.16 g

2 $O_{2}$ , 0.16 g

3 Mg, 0.44 g

4 $O_{2}$ , 0.28 g

Ans.
(1)

$n_{Mg} = \frac{1}{24} = 0.0416$ mol

$n_{O_{2}} = \frac{0.56}{32} = 0.0175 mol$

The balanced equation is:

Here, $O_{2}$ is the limiting reagent.

$∴$ $Mass of Mg left in excess = 0.0066 \times 24 = 0.16$ $g$

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