Answer the following questions involving specific heatcapacities :
a ) How much energy is required to change 42 g ice cube from iceat -11°C to steam at 111°C?
b ) Liquid nitrogen, which has a boiling point of 77 K, iscommonly used to cool substances to low temperatures. How muchenergy must be removed from 1.0 kg of gaseous nitrogen at 77 K forit to completely liquefy?
c ) How much energy is needed to melt 0.225 kg of lead so thatit can be used to make a lead sinker for fishing? The sample has aninitial temperature of 27.3°C and is poured in the mold immediatelyafter it has melted.
