The given thermochemical equation is:

**2 Mg _{(s)} + O_{2(g)} → 2 MgO_{(s) } ΔH = –1204 kJ**

**Part A. **We are asked to **determine the mass in grams of MgO that are produced** during an **enthalpy change of -238 kJ**.

Consider the following reaction: 2Mg(s) + O_{2}(g) → 2MgO(s) ΔH = -1204 kJ

How many grams of MgO are produced during an enthalpy change of -238 kJ?

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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