1.

Calculate H^o for the process Hg₂Cl₂(s) 2Hg(l) + Cl₂(g)

from the following information

Hg(l) + Cl2(g) HgCl2(s)	Ho = -187.0 kJ/mol
Hg(l) + HgCl2(s) Hg2Cl2(s)	Ho = -640.0 kJ/mol

2.

Calculate H^o for the process Co₃O₄(s) 3 Co(s) + 2 O₂(g)

from the following information

Co(s) + O2(g) CoO(s)	Ho = -157.5 kJ/mol
3 CoO(s) + O2(g) Co3O4(s)	Ho = -743.9 kJ/mol

3.

Consider the following balanced reaction:

2 A₂ + 3 B C₂ + 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	4.47
B	-20.50
C2	0.00
D	24.69

4.

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	-17.89
B	8.33
C	10.21
D	24.31