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Q.

The mass of magnesium oxide formed by burning 1.2g of Mg in excess of Oxygen is:

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a

0.2g

b

2.0g

c

1.0g

d

4.0g

answer is B.

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Detailed Solution

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2.0 g of magnesium oxide is formed by burning 1.2g of Mg in excess of oxygen.
We have,

Mg + (\frac{1}{2}) O_{2} \to MgO

Atomic mass of Mg is

\Rightarrow

24g
Molecular mass of

MgO

is

\Rightarrow 24 + 16

\Rightarrow 40 g

Now, by the unitary method we have,
24g of magnesium form 40g of magnesium oxide, therefore
1.2g of magnesium will form

\Rightarrow \frac{40}{24} \times 1.2 g

\Rightarrow 2.0 g

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The mass of magnesium oxide formed by burning 1.2g of Mg in excess of Oxygen is: