Given the following combustion reactions, what is the enthalpy of combustion of ethane?
#(i)# # C_2H_6(g)rarr 2C(s)+3H_2(g); DeltaH^@=+86*kJ*mol^-1#
#(ii)# #C(s)+O_2(g) rarr CO_2(g); DeltaH^@=-396.8*kJ*mol^-1#
#(iii)""H_2(g)+1/2O_2(g)rarrH_2O(l); DeltaH^@= -287.3*kJ*mol^-1#
1 Answer
So you want the enthalpy of combustion of ethane? I make it
Explanation:
...that is we want
We are given...
Let us take
...the which gives after cancellation....
...the which is the reaction whose
...and please note that I observe the sign parameters...
...we gets..