Question

please help in all these question ​

Answer 1

Answer:

Explanation:

Heyyaa... Here is ur answer for 69 qestion

First of all write eqation

Ch4+C2H4=C3H8

So our total enthalpy is eaqal to sun of entahlpies of prpduct minus reactant

So given

Ch4=-17.9

C2H4=12.5

C3H8= -24.8

So ∆H= products-reactants

Hence putting values

-24.8-(-17.9+12.5)

=-24.8-(-5.4)

=-24.8+5.4=-19.4

Option 4 is ur answer