Ambitioussj3449 Ambitioussj3449

10-11-2017
Chemistry

contestada

Determine the enthalpy for this reaction: mgcl2(s)+2naoh(aq)→mg(oh)2(s)+2nacl(aq) express your answer in kilojoules per mole to one decimal place.

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Annainn Annainn

03-12-2018

Given reaction:

MgCl2(s) + 2NaOH(aq) → Mg(OH)2(s) + 2NaCl(aq)

Formula:

ΔH°rxn = ∑nΔH°f(products) - ∑nΔH°f(reactants)

= [ΔH°f(Mg(OH)2) + 2ΔH°f(NaCl)] -[ΔH°f(Mg(Cl)2 + 2ΔH°f(NaOH)]

= [-924.7+2(-407.2)] - [-641.6+2(-470.1)] = -157.3 kJ/mol

Ans: Enthalpy for the reaction is -157.3 kJ/mol

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