chemistry/stoichiometry/balancing/ How to BalanceS + O2 = SO3

How to Balance Sulfur + Oxygen gas → Sulfur trioxide

How to Balance: S + O2 → SO3

Type of Chemical Reaction: This is a combination reaction.

Word Equation: Sulfur + Oxygen gas → Sulfur trioxide

Balancing Strategies: In this combination reaction be you'll need to change the coefficient on the SO3 in order to get an even number of oxygen atoms. This will make balancing the equation 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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