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Sapling Learning University of My Assignment Attempts Score 000 000 000 000 000 000 000 Copyright 20 Activities and Due Dates Chap CHM 2046 5 ALL SECTIONS 2/2015 11:30 PM A 71.2/100 Gradebook Print A calculator Periodic Table Question 8 of 11 Map ty Sci General Chemistry Compound (kJ/mol) Use the data given here to calculate the values of AGrxn at 25 C A +387.7 for the reaction described by the equation B 623.5 C +402.0 kJ mo AGE and AS are both negative values, what drives the spontaneous reaction and in wha direction at standard conditions? The spontaneous reaction is enthalpy-driven to the left. entropy-driven to the left O entropy-driven to the right. o enthalpy-driven to the right. AD Previous Give Up & View Solution Check Answer Next Exit Hint O Logout Help Resources O Assignment Information Available From: 11/12/2015 11:30 PM Due Date: Points Possible: 000 Grade Category: Graded CHM 2046 Fall 15 heck y You can view solutions when you complete or give up on any question You have ten attempts per question There is no penalty for incorrect answers. o Help With This Top Web Help & Video O Technical Support and Bug Reports

Explanation / Answer

The reaction given is

A + B <-----> C

delta G rxn = delta G (products) - delta G (reactants)

=> delta G rxn = delta G (C) - (delta G (A) + delta G (B))

=> delta G rxn = 402 - (387.7 + 623.5) = -609.2 kJ / mol

We know that,

delta G = delta H - T x delta S

where,

delta H = change in enthalpy

delta S = change in entropy

The reaction will be spontaneous when delta G will be negative.

If delta S is negative, it will add to delta G (due to - delta S)

Therefore the spontaneous reaction is,

Entropy driven to the left

Enthalpy driven to the right

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