How many moles of ammonia (NH3) are required to produce 78.0g of water?

In which situation can a mixture always be called a solution

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?