1. if you have 20 grams of parent material and two half-lives go by, how much parent material do you have remaining? how much daughter material do you now have?

How much heat transfer (in kj) is necessary to raise the temperature of a 0.250 kg piece of ice from −24.0°c to 128°c, including the energy needed for phase changes? (assume the substance remains at a constant volume throughout each stage of the heating process.)