How many moles are in 23.8 g of sulfur dioxide

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

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?