1 kg of ice at 10c is converted to 1 kg of steam at 600f wha

1 kg of ice at -10c is converted to 1 kg of steam at 600f. what is the total number of joules needed to do so?

Solution

Questions like these test your ability to sum up the energy inputs to a substance that also undergoes phase changes. With this question, you have H2O which transitions from a solid phase (ice) to the liquid phase (water) to the gas phase (steam).

H2O (s) => H2O (l) => H2O (g)

The amount of energy as measured in calories or Joules or other forms of the units of energy (BTUs?) that is required either to raise the temperature of the molecule in its present phase or to cause a phase change is known for water by a series of constants or factors. You need to get each of these values in order to determine the energy input, which also a function of the amount (or mass) of the water (in grams or moles or whatever). Thus, you need to know:

1. amount of energy needed to raise 1 gram solid H2O (ice) by 1