Question

the heat of combustion of ammonia and hydrogen 9.06 and 68.9 kilo calories respectively calculate the heat of formation of ammonia​

Answer 1

Answer:

heat of formation of ammonia​ is -94.29 Kcal

Explanation:

We are given that;

NH3+3/4O2→1/2N2+3/2H2O      ΔH=−9.06 Kcal             eq (i)

H2+1/2O2→H2O        ΔH=−68.             eq (ii)

Heat of formation is to be calculated for  

1/2N2+3/2H2→2NH3

Multiply equation (ii) by 3/2  

3/2H2+3/4O2→3/2H2O            ΔH=−68.9×3/2=−103.35 Kcal  

reverse equation (i)  

1/2N2+3/2H2O→NH3+3/4H2              ΔH=+9.06Kcal

Now add both equations the terms on other sides will cancel out so finally we will get  

1/2N2+3/2H2→NH3       ΔH=−103.35+9.06 ΔH=−94.29 Kcal

Hence the heat of formation of ammonia​ is -94.29 Kcal

Answer 2

Answer:

Refer the attachment

Hope it helps you