Question: A student boils 100 grams of water to form water vapor (gas). What method should the student use to determine that the mass of the water vapor is equal to 100 grams?
Options:
measuring the amount of water vapor (gas) in the air
collecting the water vapor (gas) and cooling it back to a liquid
weighing the beaker before and after the water is boiled
comparing the temperature of the boiling water to the temperature of the water vapor (gas)
Answer: collecting the water vapor (gas) and cooling it back to a liquid