How many moles of no3 are there in 6.2g

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

Can you guys answer these questions i need it before 1: 00pm

What happens to acetone molecules when you add heat to a beaker of liquid acetone?