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https session masteringchemistry.com myct itemView?offset-next assignmentProblemlDz91517698 G Google YouTube iy Myunwindsor u, Blac Chap. 6 Formation Reactions kboard M Gmaill @ Pearson e Chegg TimShark-CIBC ra (6) Facebook Microsoft v Resources « previous | 7 of 8 next Formation Reactions Part A The standard heat of formation, At Ho is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have {Ho-0 Heat of formation values can be used to calculate the enthalpy change of any reaction. For which of the following reactions is 4Ho equal to (Ho of the product(s)? You do not need to look up any values to answer this question. Check all that apply. Consider, for example, the reaction Hints 2NO(9) + 02(9) 2NO2(9) with heat of formation values given by the following table Substance (kJ mol ) NO(9)90.2 02(9) 0 NO2(9)332 H2O2(1)102(g)+ H2O(g) 2H2(g) +02(g)2H2O(g) 2Li(s) + Cl2(g)--2LiCI(5) Li(s) + C12()LiCl(s) Then the heat of formation for the overall reaction is (H"(products)-,,H"(reactants) 2(33.2) -114 kJ mol-1 4H'= (2(90.2) +0 = Submit MY § Give Up Incorrect, One attempt remaining; Try Again Look again at the coefficients in the reactions. The heat of formation is defined by a reaction that forms one mole of product

Explanation / Answer

Ans Part A : The correct choices are :

H2(g) + 1/2 O2 (g) = H2O (g)

Li (s) + 1/2Cl2 (g) = LiCl (s)

For the reaction to qualify as the reaction of formation , it must show the formation of one mole of product. It must be formed out of the reactants that are present in their standard states such that the enthalpy of formation associated with the reactants is 0.

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