How many molecules of CO2 are contained in a 10.0 L tank at 7.53 atm and 485 K?
5.69 × 1023 molecules
1.14 × 1024 molecules
4.89 × 1024 molecules
3.30 × 1024 molecules
2.28 × 1024 molecules

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium