Neither, boiling and melting point per element varies from element to element on the periodic table. Family trends and period trends determine what kind of element each aspect is.
I think it takes about 278g but I'm not 100% sure
Speed is the rate at which something goes, and velocity is the average acceleration, which means a car can go slow for a bit, and fast for a bit, and have a velocity of medium. Also, speed is much easier to measure.
It is 3 moles. Don't doubt urself
Im sorry , Im confused reading this . maybe enter a image ?