HELL! The students were making zinc, Zn by reacting copper, Cu, with zinc nitrate, Zn(NO3)2. They were expecting to produce 5.63 g of copper but they recovered only 5.1 g copper. Calculate the percent yield

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution?

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 substance has a mass of 9.5g and volume of 2.1cm^3