The heat of combustion for 1 mole of propane. C_3H_8, at standard conditions is
ID: 1051777 • Letter: T
Question
The heat of combustion for 1 mole of propane. C_3H_8, at standard conditions is -2.046 kJ. Write a balanced chemical equation for the combustion of propane. Calculate the heat of formation, Delta H degree_f, of propane given that the Delta H degree_f of gaseous water is -242 kJ/mole and the Delta H degree_f of carbon dioxide gat is -394 kJ/mole. Which of the two formation reactions below would you predict to have the largest exothermic heat of formation? Justify your reasoning. 2Al(s) + O_2(g) rightarrow Al_2O_3(s) Mg(s) + 1/2 O_2(g) rightarrow MgO(s)Explanation / Answer
19)
a)
C3H8 + 5 O2 -> 3 CO2 + 4 H2O
b)
delta H = 3*deltaHf (CO2) + 4*deltaHf (H2O) - deltaHf(C3H8) - 5*deltaHf(O2)
-2056 = 3*(-394) +4*(-242) - deltaHf(C3H8) -5*0
deltaHf(C3H8) = -94 KJ/mol
Answer: -94 KJ/mol
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