Heating value of liquid-gas mixture was tested with primus which has gas burner. In the initial state aluminum container with lid protected from the wind has temperature of 0 celsius and in it 0,54 kg of water and 0,82 kg of ice cubes. Mixture was then heated to 100 celsius. During the heating 0,022 kg of liguid-gas was consumed. Evaluate heating value on the basis on these data. What factors are likely to contribute to the fact that the heating value that you get diverges from the real Heating value? Just some hint please I think I could use equation of thermal energy $U=C(T)\Delta T$, but then what you need the masses of water and ice cubes for? I could not find any formulas for heating value, why?
The reason your professor has specified a mixture of ice and water is to check that you know about latent heat of fusion. Your professor won't be amused if I say any more, but a quick Google should tell you what extra bit you need to do when calculating the heat required to get the water and ice to 100C. If you're still unsure please ask as a comment to this answer.