TC03E08 A chemical reaction carried out at 30 °C takes in 550 J of heat which is transferred from the surroundings. The...
TC03E08
A chemical reaction carried out at 30 °C takes in 550 J of heat which is transferred from the surroundings. The reaction produces a gaseous product so that the reaction does 280 J of work on the atmosphere as the chemicals expand. What is ΔU for this reaction?
Select one:
a. -830 J
b. +270 J
c. -270 J
d. -278 J
e. +830 J
Homework Answers
apply first law of thermodynamics
ΔU = q + w
q= heat transferred , since the heat is transferred from the surrounding it means heat is absorbed by the system therefore it will be positive
q = + 550 J
w = work done on the atmosphere means work is done by the system . work done by system is negative
w = - 280 J
ΔU = + 550 + ( - 280) = 550 - 280 = 270 J
answer is option B +270 J
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