问题
选择题
已知：O2(g) = O2+(g)+e－ 
H1=" +1175.7" kJ·mol-1
PtF6－(g) =PtF6(g)+e－ H2=" +771.1" kJ·mol-1
O2+(g)+PtF6－(g) =O2PtF6(S) H3=" -482.2" kJ·mol-1
则反应O2(g)+PtF6(g) = O2PtF6 (s)的H是
A．77.6 kJ
B．-77.6 kJ·mol-1
C．+77.6kJ·mol-1
D．-886.8kJ·mol-1
答案
答案：B