chemistry/stoichiometry/balancing/ How to BalanceAl2O3 + H2SO4 = Al2(SO4)3 + H2O

How to Balance Aluminum oxide + Sulfuric acid → Aluminum sulfate + Water

How to Balance: Al2O3 + H2SO4 → Al2(SO4)3 + H2O

Type of Chemical Reaction: This is a double replacement reaction.

Word Equation: Aluminum oxide + Sulfuric acid → Aluminum sulfate + Water

Balancing Strategies: In this double replacement reaction we have Al2O3 + H2SO4 producing Al2(SO4)3 + H2O.

It is helpful to consider the SO4 as one item when balancing the equation. This will make things much easier.
For a complete explanation, watch:

About Balancing Chemical Equations

When balancing chemical equations our goal is to have the same number of each type of atom on both sides of the equation.

Only change the coefficients (these are the numbers in front substances).
Coefficients are the numbers in front of the molecule.
Never change the subscripts (the small numbers after elements).
Coefficients are the numbers in front of the molecule.

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