What is the mass of oxygen in 25.0 grams of potassium permanganate, KMnO4?
Your answer should contain three significant figures. Do not include units in your
answer.

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?