A chemist synthesized 0.540 kg of aspirin in the lab. If the normal dose of aspirin is two 400−mg tablets, how many doses did she prepare?

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