Thermodynamics Mock Tests

The entropy change for vaporization of a liquid with ΔHᵥₐₚ = 30 kJ/mol at its boiling point of 27°C is:

An ideal gas undergoes an isothermal process from state A to state B. The work done by the gas is given by:

A Carnot engine has an efficiency of 40% when the sink temperature is 300 K. The temperature of the source is:

A Carnot engine works between a hot reservoir at 500 K and a cold reservoir at 300 K. If the engine absorbs 1000 J of heat from the hot reservoir in each cycle, the work done by the engine per cycle is:

In an adiabatic process, no ________ enters or leaves the system:

Given: C(s) + O₂(g) → CO₂(g), ΔH = −393.5 kJ/mol. CO(g) + ½O₂(g) → CO₂(g), ΔH = −283.0 kJ/mol. What is the enthalpy of formation of CO(g) from C(s) and O₂(g)?

A gas confined in a cylinder is compressed from 5 L to 1 L against a constant pressure of 2 atm. The work done on the gas is:

Which of the following processes is exothermic?