Which expression connects the change in concentration of H2(g) with the change in concentration of C2H6(g) for the following reaction? C2H2(g)+2H2(g)C2H6(g) 2t[H2(g)]=t[C2H6]21t[H2(g)]=t[C2H6]t[H2(g)]=t[C2H6]tH2(g)]=t[C2H6]