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Laws of Chemical Combination

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Question

According to the law of conservation of mass, what would be the number of $H_{2}$ molecule in $N_{2} + H_{2} \to N H_{3}$ ?

A

2

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B

3

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C

4

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D

1

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Solution

The correct option is B
3

Law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. It can change forms, but is conserved. Hence, in a chemical reaction, the mass of the products is equal to the mass of the reactants. This is only possible if the chemical equation is balanced.

$N_{2} + 3 H_{2} \to 2 N H_{3}$

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