Please especially part c, that is the question I am most confused on. 2. write t
ID: 522393 • Letter: P
Question
Please especially part c, that is the question I am most confused on. 2. write the balanced chemical reaction equation for the combustion of liquid methanol (CH3oH). Include physical states. a. Calculate 4H0, ASo, and AG for this process at 25oC. b. Describe temperature-dependence of the spontaneity of this reaction, If it is temperature-dependent, then determine the temperature at which spontaneity changes. c. How mucli heat is involved when 0250kgofliquid methanol is combusted? Indicate whether heat is required ora emitted by this process.Explanation / Answer
CH3OH + 1.5O2 CO2 + 2H2O
Hf0 (H2O) = -285.830 KJ/mol
Hf0 (CO2) = -393.5 KJ/mol
Hf0 (CH3OH) = -238.6 KJ/mol
H0 = -393.5 -2x 241.8 +285.830 = -591.27 KJ/mol
S0 (H2O) = 69.9 J/(mol x K)
S0 (CO2) = 213.6 J/(mol x K)
S0 (CH3OH) = 126.8 J/(mol x K)
S0 (O2) = 205 J/(mol x K)
S0 = 213.6 +2 x 69.9 -(1.5 x 205 + 126.8) = -80.9 J/(mol x K)
G0 = -59127- 298x(-80.9) = -35018.8 J/mol
-59127- Tx(-80.9) < 0
T<730.86 K the reaction is spontaneous.
C) 0.250 Kg of liquid methanol
Mole of methanol = 7.81
heat required = 7.81 x -591.27 KJ/mol = 4617.81 KJ
Heat is emitted by the reaction.