Astudent dissolves 0.0688 mol of sodium hydroxide in water to make a 0.250 l solution. what is the molarity of the solution?
0.17 m
0.28 m
2.5 m

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