caculate the mole fraction of water and methanol(CH3OH) in mixture of equal mass of water and alcohol?

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

An observation that requires measurement is called quantitative observable or qualitative

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.