What method of measuring volume of these objects would be most accurate and why?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive