If the volume of the reaction vessel in part (
b. was 1.50 l, what amount of br2 (in moles) was formed during the first 15.0 s of the reaction?

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