Asubstance with a density of 2.70 g/ml occupies a volume of 21.3 ml. what is the mass of the sample

Which substance has non polar covalent bonds

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

How many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride