Problem: Consider the following reaction:2Mg(s) + O2 (g) → 2MgO(s) ΔH = - 1204How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?

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We are asked how many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure


Molar Mass MgO = 40.31 g/mol

We are asked for the heat absorbed so the ΔH should be positive. 


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Problem Details

Consider the following reaction:
2Mg(s) + O2 (g) → 2MgO(s) ΔH = - 1204

How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?

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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 Thermochemical Equation concept. You can view video lessons to learn Thermochemical Equation. Or if you need more Thermochemical Equation practice, you can also practice Thermochemical Equation practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Denton's class at MEC CUNY.