Indicate which of these processes requires more energy (for the water, the laten
ID: 1595123 • Letter: I
Question
Indicate which of these processes requires more energy (for the water, the latent heat of vaporization is of 56 J/g, the latent heat of fusion is 333 J/g and the specific heat is 4.190 J/gC). Explain your answer:
a. Heat 2g of water with temperature of 100 degrees Celsius until it evaporates completely.
b. Heat 2g of ice till 0 degrees Celsius until it melts completely.
c. Heat 2g of water elevating its temperature from 0 degrees Celsius to 100 degrees Celsius.
d. The previous processes require the same amount of energy.
Explanation / Answer
the correct answer would be: OPTION a)
Heat 2g of water with temperature of 100 degrees Celsius until it evaporates completely
heat require in this case: ms = 100x56 = 5600J
CASE B)
heat re quire = ms = 2x333 = 666 J
CASE C:
heat require = mst = 2x4.19x100 = 838J