# Problem: Calculate ΔHrxn for the following reaction: CaO(s) + CO2(g) → CaCO3(s)Use the following reactions and given ΔH’s:Ca(s) + CO2(g) + 1/2 O2(g) → CaCO3(s); ΔH = –812.8 kJ2 Ca(s) + O2(g) → 2 CaO(s); ΔH = –1269.8 kJ

###### FREE Expert Solution

We are asked to find ΔHrxn for the following reaction: CaO(s) + CO2(g) → CaCO3(s)

Modify the equation in such way that it adds up to be the target reaction.

Reaction                                                                                                Modification

Ca(s) + CO2(g) +1/2 O2(g)  → CaCO3(s)                                                 Eqn1   [no change]
CaO(s) →   Ca(s) +1/2 O2(g)                                     -(1/2)Eqn2   [reversed and multiplied by 1/2]

_________________________________

CaO(s) + CO2(g) → CaCO3(s)

Ca(s) + CO2(g) + 1/2 O2(g) → CaCO3(s); ΔH = –812.8 kJ
2 Ca(s) + O2(g) → 2 CaO(s); ΔH = –1269.8 kJ

94% (64 ratings) ###### Problem Details

Calculate ΔHrxn for the following reaction: CaO(s) + CO2(g) → CaCO3(s)

Use the following reactions and given ΔH’s:
Ca(s) + CO2(g) + 1/2 O2(g) → CaCO3(s); ΔH = –812.8 kJ
2 Ca(s) + O2(g) → 2 CaO(s); ΔH = –1269.8 kJ

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.