An ideal gas is expanded isothermally from 20 L to 30 L. During this process, 6 J of energy is expended by the external mechanism that expanded the gas. Which of the following statements is correct?

In an isochoric process, the internal energy of a system decreases by 50 J. What is the work done?

A fixed mass of an ideal gas slowly releases 1500 J of heat and as a result contracts slowly, at a constant pressure of 2.0 x 10⁴ Pa, from a volume of 0.050 m³ to 0.025 m³ . What is the effect on the internal energy of the gas?

Ten joules of heat energy are transferred to a sample of ideal gas at constant pressure. As a result, the internal energy of the gas:

An ideal gas is compressed isothermally from 30 L to 20 L. During this process, 6.0 J of energy is expended by the external mechanism that compressed the gas. What is the change of internal energy for this gas?