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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

detailed_solution_thumbnail
2.0 g of magnesium oxide is formed by burning 1.2g of Mg in excess of oxygen.
We have,
Mg + (12) O2 → MgO
Atomic mass of Mg is
⇒ 24g
Molecular mass of MgOis
⇒24+ 16 ⇒ 40g Now, by the unitary method we have,
24g of magnesium form 40g of magnesium oxide, therefore
1.2g of magnesium will form
⇒4024× 1.2g
⇒2.0g
 
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