Calculate the AH° rxn for the following reaction: H,AsO 4(aq) * 4H2(9) + 4H, '2(g) AsH3a) + 4H,00 AHº,(kJ/mol): AsH, 3(g) = -285.8 kJ = 66.4, H,AsO4(aq) = %3D -1762.0, H,Ow Select one: а. -685.2 kJ b. -1981.4kJ C. -172.2 kJ d. 685.2 kJ e. 172.2 kJ

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A: We use Hess's law to calculate the enthalpy of the reaction.

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Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.