What happens after a low-mass star runs out of helium, the core is exposed

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction