For the statements in them, put T if they are true and F if they are false. a) ( ) An ideal gas expands freely from a volume V to a volume 2V. Then, this gas freely expands from 2V volume to 3V. In this case, it is not correct to state that the The resulting change in entropy for these two expansions is equal to the change in entropy that would occur if the gas expanded freely from volume V to volume 3V. b) ( ) The Otto cycle is an idealization of engines in which expansion is so fast that it can be considered isothermal. c) ( ) No ideal engine has greater efficiency than one that has a cycle of operation between two isotherms and two adiabatic.
For the statements in them, put T if they are true and F if they are false.
a) ( ) An ideal gas expands freely from a volume V to a volume 2V. Then,
this gas freely expands from 2V volume to 3V. In this case, it is not correct to state that the
The resulting change in entropy for these two expansions is equal to the change in entropy that would occur if the gas expanded freely from volume V to volume 3V.
b) ( ) The Otto cycle is an idealization of engines in which expansion is so fast that it can be considered isothermal.
c) ( ) No ideal engine has greater efficiency than one that has a cycle of
operation between two isotherms and two adiabatic.
d) ( ) A mixture of water and ice is in thermal equilibrium at a temperature of 273 K in an ideal calorimeter (adiabatic walls). A mass M of water at temperature T is added to the calorimeter, causing a part of the ice to melt until the thermal equilibrium is again reached at 273 K. Using c for heat
specific to water, we can state that the entropy variation of the system was: ∆S = Mc [(T –273 K)/273 K + ln(T/273 K)]
e) ( ) A certain refrigerator operates with 50% of the efficiency of a Carnot refrigerator. Both work between the same temperatures TH and TC. In each cycle, the refrigerator removes QC from the cold reservoir and releases QH to the hot reservoir. In this case, it is correct to state that the
heat released into the hot tank is given by: |QH| = 2|Qc|TH - |QC|TC.
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