Please help me with this question Calculate the standard energy change, E, for t

Question

Please help me with this question Calculate the standard energy change, E, for thereaction below                   12NH3(g) + 21O2 (g) ---- 8HNO3 (L) + 4NO (g) +14H2O (g) H (KJ/mol)  45.9            0                     -133.9            91.3         -241.8 Please help me with this question Calculate the standard energy change, E, for thereaction below                   12NH3(g) + 21O2 (g) ---- 8HNO3 (L) + 4NO (g) +14H2O (g) H (KJ/mol)  45.9            0                     -133.9            91.3         -241.8

Explanation / Answer

delH = H_products - H_reactants delH = [14*-241.8 + 4*91.3 + 8*-133.9] - [21*0 + 12*45.9] delH = -4642 kJ delH = delE + (PV) PV = nRT delH = delE + RTn T = 298 K,   R = 8.314 J/mol/K   n =change in moles of gas = [14 + 4] - [21 + 12] = -15 moles delE = delH - RTn = -4642 kJ - 8.314 J/mol/K *298K *(-15 mol) *(1 kJ/1000J) delE = -4604.84 kJ delE = -4.60 x 103 kJ

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