When the following equation is balanced, what is the coefficient for NaNO3? _AI(NO3)3 +_Na2SO4 →
Al2(SO4)3 +
--- NaNO3
A.1
B.2
C.3
D.6

The coefficient for NaNO₃ = 6

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:  

•1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.  

•2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product  

•3. Select the coefficient of the substance with the most complex chemical formula equal to 1  

Reaction

AI(NO₃)₃ +Na₂SO₄ → Al₂(SO₄) + NaNO₃

give coefficient

aAI(NO₃)₃ +bNa₂SO₄ → Al₂(SO₄)₃ +c NaNO₃

Al, left=a, right=2⇒a=2

N, left=3a, right=c⇒3a=c⇒3.2=c⇒c=6

Na, left=2b, right=c⇒2b=c⇒2b=6⇒b=3

The equation becomes :

2AI(NO₃)₃ +3Na₂SO₄ → Al₂(SO₄)₃ +6NaNO₃

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