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CH₄ + 2O₂ → CO₂ + 2H₂O
ΔH reaksi = ΔH produk - ΔH reaktan
ΔH reaksi = [CO₂ + (2 x H₂O) ] - [CH₄ + (2 x O₂) ]
ΔH reaksi = [-393,5 + ( 2 x -242) ] - [-74,81 + (2 x 0) ]
ΔH reaksi = [-393,5 - 484 ] + 74,81
ΔH reaksi = -877,5 + 74,81
ΔH reaksi = -802,69 Kj
Jadi, ΔH reaksi dari persamaan reaksi CH₄ + 2O₂ → CO₂ + 2H₂O adalah -802,69 Kj (Jawaban B)
Kanan - kiri
(-393,5 +( 2 x -242 ) ) - ((- 74,81) + 2 x 0)
-393,5 -484 +74,81
-877,5 +74,81
-802,69