已知同温同压下,下列反应的焓变和平衡常数分别表示为
H2(g) + 1/2O2(g) = H2O(g) △H1 K1
1/2N2(g) + O2(g) = NO2(g) △H2 K2
1/2N2(g) + 3/2H2(g) = NH3(g) △H3 K3
则反应2NH3(g) + 7/2O2(g) = 2NO2(g) + 3H2O(g)的△H和K分别为
A.2△H1+2△H2-2△H3 3K1+2K2-2K3 |
B.2△H3-3△H1-2△H2 K13K22/K32 |
C.3△H1+2△H2-2△H3 K13K22/K32 |
D.3△H1+2△H2-2△H3 3K1+2K2-2K3 |