题目内容
(请给出正确答案)
[单选]
It's ___ that the sick child needs food and sunshine.
A、conscious
B、obvious
C、consistent
D、plain
查看答案
A、conscious
B、obvious
C、consistent
D、plain
已知下列反应的标准摩尔焓变,计算298K时SiC(s)的ΔH。
(1) C(s)+O2(g)====CO2(g),ΔH=-393.5 kJ·mol-
(2) Si(s)+CO2(g)====Si(s)+O2(g),△H=-989.2kJ/mol