5. + -3 points OSColPhys2016 14.3.P.012 My Notes An ice bag containing 0C ice is

Question

5. + -3 points OSColPhys2016 14.3.P.012 My Notes An ice bag containing 0C ice is much more effective in absorbing heat than one containing the same amount of 0°C water (a) How much heat (in J) is required to raise the temperature of 0.700 kg of water from 0°C to 26.0%C? (b) How much heat (in ) is required to first melt 0.700 kg of 0°C ice and then raise its temperature? (c) Explain how your answers support the contention that the ice is more effective. This answer has not been graded yet Additional Materials Reading

Explanation / Answer

Part A.

Heat required is given by:

Q = m*Cw*dT

Cw = 4186 J/kg-C

Q = 0.700*4186*(26 - 0)

Q = 76185.2 J

Part B

In this case first energy will be required to melt the ice and then to raise the temperature, So

Q = Q1 + Q2

Q1 = m*Lf = energy required to change ice in water

Lf = 3.34*10^5 J/kg

Q = 0.7*3.34*10^5 + 0.7*4186*26

Q = 309985.2 J

Part C

fromPart A and B we can see that energy reuqired to melt ice is higher than energy required to raise the temperature of water. Which means ice can absorb more energy without raising temperature.

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