How many c-13 atoms are present, on average, in a 2.1000×104-atom sample of carbon?

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 blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood

Some animals that try to adapt to climate changes eventually die due to starvation, as climate change alters the web.