Which of the following are chemical changes? check all that apply.
gasoline is evaporated,
water is frozen,
water is boiled,
water is heated up,
gasoline is burned.

What is the mass of sodium in 3 moles of sodium chloride

What is the molar mass of a gas that has density of 2.054 g/l

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.