Enaloy question .............

Question

Consider the following balanced reaction:

2 A₂ + B → C + 2 D

What is the enthalpy of reaction if the enthalpy of formation of the compounds is given as

Compound	Enthalpy of Formation (kJ/mol)
A2	-15.64
B	-1.02
C	10.21
D	9.64

 ^kJ/_mol

Answer 1

∑products - ∑reactants

∑products = 2x9.64 + 10.21 = 29.49 kJ/mol

∑reactants = 2x-15.64 + -1.02 = -32.3 kJ/mol

∆Hreaction = 29.49 - (-32.3) = 61.8 kJ/mol

Answer 2

H of reaction = H formation of products- H formation of reactants

= (9.64×2+ 10.21) - ( -1.02+ 2×-15.64)

= + 61.78kj mol^-