Calculate G system for process below, and state if the process is spontaneous or nonspontaneous. H system = -43 kJ, T = 294 K, S system = - 118 J/K 

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?

What is the formula of the ionic compound composed of calcium cations and chloride anions

How does a nuclear reactor produce electricity?