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Consider the following reaction: 2Mg(s)+O2(g) → 2MgO(s), ΔH=−1204kJ. Is this reaction exothermic or endothermic? How do you calculate the amount of heat transferred when 2.4 grams of Mg(s) react at constant pressure?

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Alyssa Mae Remarim
Alyssa Mae RemarimLv10
21 Oct 2020

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Related questions

Consider the reaction: 2 Mg(s) + O2 (g) ? 2MgO(s) ?H = -1204 kJ (a) Is this reaction exothermic or endothermic?(b) What is the enthalpy change for the reverse reaction? Is the reverse reaction exothermic or endothermic?(c) Calculate the amount of heat transferred when 7.10 g of Mg(s) reacts at constant pressure with excess oxygen.(d) How many grams of MgO are produced during a run of this reaction which experiences an energy change of - 234 kJ?

Consider the following reaction:
2 Mg(s) + O2(g) 2 MgO(s) ∆H = -1204 kJ

(a) Is this reaction exothermic or endothermic?
(b) Calculate the amount of heat transferred when 3.55 g of Mg(s) reacts at constant pressure.
(c) How many grams of MgO are produced during an enthalpy change of –234 kJ?
(d) How many kilojoules of heat are absorbed when 40.3 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure?

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