Solve the all parts of given problem:
Problem: A sealed container holds .020 moles of ideal nitrogen gas at a pressure of 1.5 atmospheres and a temperature of 290 K. The atomic mass of nitrogen is 14.0 g/mol.
Part A: What is the approximate mass density of the gas, in SI units?
Part B: What is the approximate transitional kinetic energy of a nitrogen molecule, in SI units?
It'd be really helpful if you could show all steps of your work.