Whats a mixture of minerals, volcanic glass, organic matter, or other material?

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?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa