In this example you were told to assume that all of the ice if you did not know?

Question

In this example you were told to assume that all of the ice if you did not know? If there had been more ice placed into the cola, it is possible that the cola cooled to 0 degree C and there would still be solid ice in the drink. You would know this occurred if you assumed that all the ice melted and ended up with a final temperature that was a negative value. This would be a clue to you that some of the ice had not melted. If this occurs, you must re-do the problem, assuming a final temperature T_t = 0 degree C. The unknown then becomes the mass of the ice melted, m. Use T_1 = 0 degree in the equation and solve for m How much heat energy is given out when 500 g of steam at 100 degree C condenses and then cools to 50 degree C? Why is a scald by steam at 100 degree C much more painful than one by water at 100 degree C?

Explanation / Answer

1)
Energy in condensing =mL = 0.5*2260000 = 1,130,000 J
Energy during cooling = mC = 0.5*4200*50 = 105,000 J
Total energy given out = 1,130,000 + 105000 = 1,235,000 J =1,235 kJ

2)
It has to condense before cooling so giving out a large amount of latent heat.

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