21.16g甲烷在32g氧氣中燃燒生成氣態二氧化碳及液態水時,放熱445.5kJ,由此判斷下列 熱化學反應式,哪一項正確?
(A) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = −445.5 kJ/mol
(B) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = +445.5 kJ/mol
(C) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = −891 kJ/mol
(D) CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH = +891 kJ/mol