Question

A question on standard enthalpy change

Answer 1

I know the answer is A and I did it correctly in my mock exam. But somehow, I don't know how the answer comes. Can anyone kindly explain it? Thanks!

Answer 2

its simple whenver we calculate we allways do
reactant -product=enthalpy change ok

Answer 3

ok now u are given reaction is
C2H2 +2H2----------------------> C2H6
now u are given for
C2H2=x
H2=y but u have two moles of H2 den it will become 2y
C2H6=z
now putting the values in above formula u ll get it ok
x+2y-z

Answer 4

Thanks heena!!!! Simple enough :D

Answer 5

ya gud heena ...glt kya hai isme ...good

Answer 6

heena why u gave me a medal??