What happens to the molecules of water when water changes from a liquid to a vapor?

they become smaller.

they become heavier.

they move farther apart.

they increase in number.

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.

Light waves travel than sound waves.

Which change to the system wood cause the freely-moving piston to lower?