What is the standard enthalpy of formation of What is the standard enthalpy of formation of ...
What is the standard enthalpy of formation of What is the standard enthalpy of formation of
CH 3 CH 2 CH 2 CHO(l)? CH3CH2CH2CHO(l)? 2CH 3 CH 2 CH 2 CHO(l)+5O 2 (g)→8H 2 O(l)+8CO 2 (g); 2CH3CH2CH2CHO(l)+5O2(g)→8H2O(l)+8CO2(g);
ΔH°=–4943.6 kJ ΔH°=–4943.6 kJ
Substance ΔH° f (kJ/mol)
CO 2 (g) -393.5
H 2 O(l) –285.8
a.
–245.4 kJ/mol
b.
+245.4 kJ/mol
c.
–1792.5 kJ/mol
d.
–3151.1 kJ/mol
e.
+3151.1 kJ/mol
Homework Answers
delta(H) of reaction = delta(H f)product - delta(H f)reactant
delta(H f) of O2(g) = 0
-4943.6 = 8*(-393.5) + 8*(-285.8) - 5*0 - 2*x
-4943.6 = -3148 - 2286.4 -2*x
2*x = 4943.6 -3148 - 2286.4
2*x = 4943.6 - 5434.4
2*x = -490.8
x = -245.4 KJ/mol
standard enthalpy of formation of CH 3 CH 2 CH 2 CHO = -245.4 KJ/mol
Answer : option a
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