Using standard enthalpies of formation (Delta H degree_f) from you textbook, cal

Question

Using standard enthalpies of formation (Delta H degree_f) from you textbook, calculate Delta H degree for the following reactions. Please use 109.9 kJ/mol for HCN, -4120.8 kJ/mol for Ca_3(PO_4)_2 and -1288.0 kJ/mol for H_3PO_4, the remaining compounds can be found in appendix 4 of your textbook. a. 2NH_3(g) + 3O_2(g) + 2CH_4(g) rightarrow 2HCN(g) + 6H_2O(g) b. Ca_3(PO_4)_2 (s) + 3H_2SO_4(l) rightarrow 3CaSO_4(s) + 2H_3PO_4 (l) c. 2 NO_2(g) rightarrow N_2O_4 (l) d. 2Al(s) + Fe_2O_3(s) rightarrow Al_2O_3(s) + 2 Fe(s)

Explanation / Answer

I am providing general formula to calculate enthalpy of the reaction. aA+bB--------cC + dD

Enthalpy of the reaction =[c* Hof(C)+ d*Hof(D)] -[a*Hof(A)+b*Hof(B)]

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