High-altitude mountain climbers do not eat snow, but always melt it first with a

Question

High-altitude mountain climbers do not eat snow, but always melt it first with a stove. To see why, calculate the energy absorbed from a climber's body under the following conditions. The specific heat of ice is 2100 J/kgC, the latent heat of fusion is 333 kJ/kg, the specific heat of water is4186 J/kgC.

Part A

Calculate the energy absorbed from a climber's body if he eats 0.80 kg of-15C snow which his body warms to body temperature of 37C.

Express your answer to two significant figures and include the appropriate units.

Part B

Calculate the energy absorbed from a climber's body if he melts 0.80 kg of-15C snow using a stove and drink the resulting 0.80 kg of water at 2C,which his body has to warm to 37C.

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

part A

energy absorbed Q = Mice*cice*dt1 + Mice*Lf + Mice*cwater*dt2

Q = (0.8*2100*15)+(0.8*333000)+(0.8*4186*37)

Q = 415505.6 J

part B)

energy required to melt ice to 2 degrees water

Q1 = Mice*cice*dt1 + Mice*Lf + Mice*cwater*dt3

Q1 = (0.8*2100*15)+(0.8*333000)+(0.8*4186*2)

Q1 = 298297.6 J

energy absorbed from climber's body E = Q - Q1 = 117208 J <<<------answer

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