Given the following reactions: Acetic acid (MW = 60 g/mol) Based on the energies

Question

Given the following reactions:

Acetic acid (MW = 60 g/mol)

Based on the energies of the individual bonds of reactants and products, what is the principle reason that the butane reaction is so much more exothermic? Please choose one correct answer:

Butane is the best fuel

Butane has the highest %H by mass

Butane produces the highest number of moles of CO2 (g)

Butane consumes the highest number of moles of O2(g)

Butane is the best fuel

Butane has the highest %H by mass

Butane produces the highest number of moles of CO2 (g)

Butane consumes the highest number of moles of O2(g)

C4H10 (l) + Butane (MW 13/2O2(g) 58 g/mol) 4CO2(g) 5H20 (g) Ho=-2635 kJ/mol + 4H20 (g) Ho=-1845 kJ/mol C3H7OH (I) + 502(g) 3CO2(g) Propanol (Mw = 60 g/mol) + C2H402 (I) + 3 O2(g) 2 CO2(g) + 2 H20 (g) Ho--785 kJ/mol

Explanation / Answer

Ans : Butane produces the highest number of moles of CO2 (g)

When the reaction loses off heat , it is said to be exothermic. The energy is required to break the bonds , whereas the energy is released , when new bonds are formed. Since the reaction of butane forms maximum number of moles of CO2 , so the amount of energy released is more.

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