Medium
Which of the following set of coefficients would balance the given chemical equation SO2 + O2 -> SO3?
Explanation
Explanation
Balancing 2SO2 + O2 -> 2SO3 gives 4 S and O atoms balanced on both sides (2 S + 4+2=6 O on left = 2 S + 6 O on right), matching coefficients 2, 1, 2.
PRO TIP
Re-check your working by substituting the answer back into the original question.