Butane + Oxygen

Butane + Oxygen ➜ Carbon Dioxide + water
2C₄H₁₀ + 13O₂ ➜ 8CO₂ + 10H₂O
molecular weights
C = 12
H = 1
O = 16
2C₄H₁₀ = 2•58 = 116
13O₂ = 13•32 = 416
8CO₂ = 8•44 = 352
10H₂O = 10•18 = 180
check 116+416 = 352+180 = 532

116 grams of C₄H₁₀ + 416 grams of O₂ ➜ 352 grams of CO₂ + 180 grams of H₂O
2 mole of C₄H₁₀ + 13 moles of O₂ ➜ 8 mole of CO₂ + 10 moles of H₂O