Thermodynamics Test 1

For a reversible process, the change in entropy of the universe is:

A sample of an ideal gas undergoes a cyclic process. The net work done on the gas in the cycle is positive. What can be concluded about the heat exchange ($q$) during this cycle?

Which of the following processes is associated with a decrease in entropy?

In an adiabatic free expansion of an ideal gas, which of the following is true?

A gas expands from 10 L to 20 L against a constant external pressure of 2 atm. If the internal energy of the system decreases by 500 J, what is the heat change (q) of the process? (1 L·atm = 101.3 J).

For a reversible process, the change in entropy of the universe is:

An ideal gas undergoes a cyclic process. The net work done on the gas is positive. What can be concluded about the heat exchange (q) during this cycle?

A reaction has a standard enthalpy change of +100 kJ/mol and a standard entropy change of +250 J/mol·K. At what temperature will the reaction become spontaneous?

For which of the following processes is the change in internal energy equal to the heat absorbed by the system?

The enthalpy of combustion of carbon is -393.5 kJ/mol. What is the heat released when 120 grams of carbon are completely combusted? (Molar mass of carbon = 12 g/mol)