Plz help me I need help Sorry I can't find science but this is SCIENCE

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

An object displaces 652 ml of water. the volume of the object is: 0.652 cm³ 6.52 cm³ 65.2 cm³ 652 cm³