Suppose that the amount of heat removed when 13.8 kg of water freezes at 0.0 °C were removed from ethyl alcohol at its freezing/melting point of −114.4 °C. How many kilograms of ethyl alcohol would freeze?

Answer 1

Two problems here wrapped up in one. First you must determine how much heat was removed from the water. That's
q = mass H2O x heat fusion
q = 13,800 g H2O x heat fusion = ?
You must look up heat fusion.
Next, use q = mass EtOH x heat fusion for EtOH. Plug in heat fusion and q and solve for mass EtOH.
Post your work if you get stuck.