Final answer:
The false statement is 'All gases are ideal gases.' Real gases deviate from ideal behavior, and ideal gas is a theoretical construct used to model gas properties under certain conditions.
Step-by-step explanation:
The statement that is false is: a. All gases are ideal gases. While the ideal gas law is a helpful model to predict the behavior of gases under certain conditions, in reality, no gas perfectly fulfills the criteria of an ideal gas. Ideal gases are theoretical constructs in which the gas particles are considered to have no volume and no intermolecular forces. Real gases deviate from ideal behavior, especially at high pressures and low temperatures.
Statement b. STP conditions are 273 K and 101.325kPa is true, although note that STP defined as exactly 100 kPa and 273 K is also used. Statement c. A characteristic gas constant has units of J/(kgK) is also true, although this is a specific gas constant different from the universal gas constant R, which is 8.3145 J/(K·mol). Statement d. An ideal gas is one that obeys the gas laws is an accurate representation of what an ideal gas is defined as, which is a gas that conforms strictly to the ideal gas law.