previous heat or formation, He, is defined as The s the enthalpy change for the

Question

previous heat or formation, He, is defined as The s 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 Ar-0 Heat of formation values can be used to calculate the enthalpy change of any Part A For which or the following reactions is Hon equal to 1f of the You do not need to look up any values to answer this q Check all that apply s)? Consider, for example, the reaction Hints 2NO(g) +O2(g) 2NO2(8) with heat of formation values given by the following table O C(s,graphite) + 02(8)CO2(8) AH (kJ/mol) Substance NO(E) 90 2 02(8)o NO2(g)332 Na(s)+P2(g)NaF(s) CaCO3(g)CaO+CO2(g) Na(s)ttF2(1)-NaF(s) 2Na(s) + F2(g)-2NaF(s) Then the standard heat of reaction for the overall reaction is Hemi (products)- (reactants) Give Up 2(33.2) -12(90.2) t.Oj 114 kJ to search

Explanation / Answer

for delta hf:

rule 1 : there must be 1 mol of product formed

rule 2: Reactant must be element in their standard state

option 1: correct

option 2: not correct

CO is not an element. rule 2 fails

option 3: correct

option 4: not correct

CaCO3 is not an element. rule 2 fails

option 5: Not correct

standard state of F2 is gas and not liquid. rule 2 fails

option 6: not correct

2 moles of product is formed. rule 1 fails

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