Check all that apiy CHH4(e+3O4(e)2COO(c)+2H4OVe) o Whw drobtate abotig The standard heat of formation, Hf, 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 Hf=0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Consider, for example, the reaction 2NO(g)+O2(g)2NO2(g) with heat of formation values given by the followinn tahle: Then the standard heat of reaction for the overall reaction is Hrn=Hi(products)Hf(reactants)=2(33.2)[2(90.2)+0] For which of the following reactions is Hrenequal equat Hf of the product(s)? You do not need to look up any values to answer this question. Check all that apply. View Available Hint(s) Na(s)+21F2(l)NaF(s)SO3(g)21O2(g)+SO2(g)2Na(s)+F2(g)2NaF(s)SO(g)+21O2(g)SO2(g)S(s)+O2(g)SO2(g)Na(s)+21F2(g)NaF(s) Part B The combustion of ethene, C2H4, occurs via the reaction C2H4(g)+3O2(g)2CO2(g)+2H2O(g) with heas of formation values given by the following table: Calculate the enthalpy for the combustion of 1 mole of ethene Express your answor to four significant figures and include the appropriate units. b Vlew Avaitanle Himtse)