The standard heat of formation, ??\', is defined as the enthalpy change for the

Question

The standard heat of formation, ??', 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 AH. Heat of formation values can be used to calculate the enthalpy change of any reaction For which of the following reactions is ??.xn equal to 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 View Available Hint(s) 2NO(g) 02(g) 2NO2(g) with heat of formation values given by the following table: Substance (kJ/mol) O Na(s) C2(1)-NaCl(s) | Na(s) + ? Cl2(g)?NaCl(s) NO(g) 90.2 02(g)0 NO2 (g)33.2 H202(g)-02(8) +H20(g) O 2H2(g) O2 (g)-2H2O(g) Then the standard heat of reaction for the overall reaction is 2Na(s) Cl2 (g)+2NaCl(s) Alrx,-??? (products).. - 2(33.2) ??¡(reactants) [2(90.2) + ? - 114 kJ SubmitP

Explanation / Answer

for delta Horxn to be delta Hof,

rule 1: there must be only 1 mol of product being formed

rule 2: reactant must be element in there standard state

option 1 is correct

option 2 is not correct as standard state of Cl2 is gas

option 3 is correct

option 4 is not correct as H2O2 is compound of H and O

option 5 is not correct as 2 mol of H2O is formed

option 6 is not correct as 2 mol of NaCl is formed

Answer: option 1,3

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