Under which conditions do you expect helium gas to deviate most from ideal behavior? . a. 100 k and 1 atm. b. 300 k and 2 atm. c. 100 k and 5 atm.

Ideal behavior is approached by gases when the conditions of the system are at a low pressure and high temperatures. Therefore, the correct answer is C. At the conditions of lowest temperature highest pressure, gases will deviate from an ideal gas.