How many chlorine atoms are there in the reactants: 2al+3cl2→2alcl3? ?

a. 2
b. 1
c. 3
d. 6

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

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?