1.
(2024高二上·海南期末)
已知在25 ℃、101 kPa下,1 g C8H18(辛烷)燃烧生成二氧化碳和液态水放出48.40 kJ热量,表示上述反应的热化学方程式正确的是( )
A . C8H18(l) + O2(g)=8CO2(g) + 9H2O(l) ΔH=-48.40 kJ·mol-1
B . C8H18(l) + O2(g)=8CO2(g) + 9H2O(l) ΔH=-5 518 kJ·mol-1
C . C8H18(l) + O2(g)=8CO2(g) + 9H2O(l) ΔH=+5 518 kJ·mol-1
D . C8H18(l) + O2(g)=8CO2(g) + 9H2O(l) ΔH=+48.40 kJ·mol-1