How many molecules are in 4.00 moles of oxygen

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

What type of matter is made of only one kind of atom