What is the expression for Kc for the following reaction: 2C2H4(g)+2H2O(g)⇌2C2H6(g)+O2(g)"
a) [C2H6]²/[C2H4]²[H2O]²[O2]
b) [C2H6][O2]/[C2H4]²[H2O]²
c) [C2H6][O2]/[C2H4][H2O]²
d) [C2H6]²[O2]/[C2H4]²[H2O]²