# Problem: Calculate ΔHrxn for the reaction CaO(s) + CO2(g) → CaCO3(s) given these reactions and their ΔH values: Express the enthalpy in kilojoules to one decimal place.Ca(s) + CO2(g) + 1/2O2 → CaCO3 (s)   ΔH = −814.1 kJ2Ca(s) + O2(g) → 2CaO(s)                    ΔH = −1269.8 kJ

###### FREE Expert Solution
92% (329 ratings)
###### FREE Expert Solution

To find the ΔHrxn, we need to use the Hess's Law where we have to rearrange the given equations to get the desired reaction.

92% (329 ratings)
###### Problem Details

Calculate ΔHrxn for the reaction CaO(s) + CO2(g) → CaCO3(s) given these reactions and their ΔH values:

Express the enthalpy in kilojoules to one decimal place.

Ca(s) + CO2(g) + 1/2O2 → CaCO(s)   ΔH = −814.1 kJ

2Ca(s) + O2(g) → 2CaO(s)                    ΔH = −1269.8 kJ

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 .

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Our tutors rated the difficulty of Calculate ΔHrxn for the reaction CaO(s) + CO2(g) → CaCO3(s) ... as medium difficulty.

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Our expert Chemistry tutor, Dasha took 6 minutes to solve this problem. You can follow their steps in the video explanation above.

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Based on our data, we think this problem is relevant for Professor Dixon's class at UCF.