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Question

Estimate the value x to balance the given equation.

Mg3N2 (aq)+xH2O (l)3Mg(OH)2 (aq)+2NH3 (g)

A
2
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B
4
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C
6
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D
8
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Solution

The correct option is C 6
A balanced chemical equation has an equal number of atoms on both the sides of a chemical reaction.

For the given equation: Mg3N2 (aq)+xH2O (l)3Mg(OH)2 (aq)+2NH3 (g)
Reactants Products
Elements No. of atoms Elements No. of atoms
Mg 3 Mg 3
N 2 N 2
H 2 H 12
O 1 O 6

Here, Mg and N atoms are balanced at both sides. To balance H and O atoms, the value of x should be 6.

Hence, the balanced equation is:
Mg3N2 (aq)+6H2O (l)3Mg(OH)2 (aq)+2NH3 (g)


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