Posted by john on Tuesday, November 1, 2011 at 4:34pm.
a) q = mass H2O x specific heat H2O x (Tfinal-Tinitial) = about 1100 J but you need to do it more accurately.
heat soln per gram = 1100/1.5g = ?
heat soln pr mol = (1100/1.5) x molar mass CaCl2.
b) Water temperature goes up so it is being heated; therefore, CaCl2 dissolving in water is an exothermic reaction.
c)I would do this.
How many joules do you want? I'm a little confused about the temperature but if we want 15 degrees above body temperature that would be about 37 for body T + 15 = about 52 for Tfinal. What do we pick for Tinitial. I don't know the answer to that and the problem doesn't help; however, I assume we might consider that the soln would be at room temperature (say 25C) before the solution was applied to the patient. So we will need
q = 100 g water x specific heat water x (52-25) = about 11,000 J (again you need it more accurately),
So how many grams will we need. If we can get 1100 from 1.5 g, we will need
1.5 x (11,000/1100) = about 15 g for 11,000 J. Check my thinking. Check my work.
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