Which processes in the table have enthalpies of combustion that are also standar

Question

Which processes in the table have enthalpies of combustion that are also standard enthalpies of formation? (Select all that apply.)

Hcomb

†

Molar Enthalpies of Combustion at 25°C and 1 atm Combustion Reaction Enthalpy of Combustion

Hcomb

(kJ/mol) H2(g) + 1/2 O2(g) H2O(l) 285.8 C2H2(g) + 5/2 O2(g) 2 CO2(g) + H2O(l) 1300.2 Mg(s) + 1/2 O2(g) MgO(s) 601.6 C2H5OH(l) + 3 O2(g) 2 CO2(g) + 3 H2O(l) 1366.8 CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) 890.5 C8H18(l) + 25/2 O2(g) 8 CO2(g) + 9 H2O(l) 5470.1 S(s) + O2(g) SO2(g) 296.8 C(s) + O2(g) CO2(g) 393.5 CH3OH(l) + 3/2 O2(g) CO2(g) + 2 H2O(l) 725.9 CO(g) + 1/2 O2(g) CO2(g) 283.0

Explanation / Answer

answers :

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

2)Mg(s) + 1/2 O2(g) MgO(s)

3) S(s) + O2(g) SO2(g)

4) C(s) + O2(g) CO2(g)

explanation:

one mole of substance formed in its standard state and from its constitutent elements is called standard entahlphy of formation.

here anothe term also involved that is combustion . so O2 should be present in reactants .

by satisfying these two conditions the above 4 equations are suitable

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