Which statement correctly defines mass? A. It is equivalent to weight and is expressed in pounds

B. It is equivalent to length and is expressed in feet

C. It is the amount of matter in an object

D. It is the amount of space taken by an object

Which of the following statements are evidence that gases do not always behave ideally? check all that apply.? a. co2 gas becomes dry ice (solid co2) at 1 atm and –78.5 °c. b. when two gases are mixed, they follow dalton\'s law of partial pressures. c. at 4 k and 1 atm, helium is a liquid. d. it is impossible to compress a gas enough so that it takes up no volume.