Question

In a quality control laboratory of
fuels ethanol combustion was carried out at 298
K. The thermodynamic properties at this temperature
for the substances involved in the process are found in the table below. It is considered that the state of
aggregation of reagents and products is not changed
during the process. Also, in the range of
worked temperature, the heat capacities of
all substances involved are constant.

In this regard, what is the ΔHo of the reaction at 25 º C, in kJ
for 2 moles of ethanol? This reaction is endothermic or
exothermic? Does it absorb or release heat?
a) +1644.4 kJ
b) -1644.4 kJ
c) -277.7 kJ
d) -1366.7 kJ
e) +1366.7 kJ

Answer 1

Answer:

In a quality control laboratory of

fuels ethanol combustion was carried out at 298

K. The thermodynamic properties at this temperature

for the substances involved in the process are found in the table below. It is considered that the state of

aggregation of reagents and products is not changed

during the process. Also, in the range of

worked temperature, the heat capacities of

all substances involved are constant.

In this regard, what is the ΔHo of the reaction at 25 º C, in kJ

for 2 moles of ethanol? This reaction is endothermic or

exothermic? Does it absorb or release heat?

a) +1644.4 kJ

b) -1644.4 kJ

c) -277.7 kJ

d) -1366.7 kJ

e) +1366.7 kJ

Explanation:

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