# Problem: Consider the following reaction:2Mg(s) + O2(g)→ 2MgO(s)        ΔH = -1204 kJWhich of the following statements is true?a) This reaction is endothermic.b)  This reaction represents the formation reaction for MgO and ΔHfo (MgO) = -1204 kJ.c)  When 3.55g Mg reacts at constant pressure, the heat transferred is -87.9 kJ.d)  When 40.3g MgO(s) is decomposed into Mg(s) and O2 at constant pressure, 1204 kJ is absorbed.e)  All reactants and products are not in their standard state.

###### FREE Expert Solution

For this problem, analyze each choice and determine the correct statement for the given reaction:

2 Mg (s) + O2 (g) → 2 MgO (s) ΔH = -1204 kJ

a. This reaction is endothermic.

• Recall that in thermochemistry, a reaction is considered endothermic when the reaction absorbs heat in the process.
91% (253 ratings) ###### Problem Details

Consider the following reaction:

2Mg(s) + O2(g)→ 2MgO(s)        ΔH = -1204 kJ

Which of the following statements is true?

a) This reaction is endothermic.

b)  This reaction represents the formation reaction for MgO and ΔHfo (MgO) = -1204 kJ.

c)  When 3.55g Mg reacts at constant pressure, the heat transferred is -87.9 kJ.

d)  When 40.3g MgO(s) is decomposed into Mg(s) and Oat constant pressure, 1204 kJ is absorbed.

e)  All reactants and products are not in their standard state.