a) Determine the amount of energy transferred as heat requiredto melt 3 mol of i
ID: 678536 • Letter: A
Question
a) Determine the amount of energy transferred as heat requiredto melt 3 mol of ice at0°C, heat the liquid water to 100°C, and then vaporize theliquid water at 100°C. All
processes occur at 1 bar pressure.
b) Now condense the steam, cool it to 0°C, and freeze theliquid water at 0°C to create 3
mol of ice all under 1 bar of pressure. What is the entropy andenthalpy change for the
entire process described in both parts a and b?
a) Determine the amount of energy transferred as heat requiredto melt 3 mol of ice at
0°C, heat the liquid water to 100°C, and then vaporize theliquid water at 100°C. All
processes occur at 1 bar pressure.
b) Now condense the steam, cool it to 0°C, and freeze theliquid water at 0°C to create 3
mol of ice all under 1 bar of pressure. What is the entropy andenthalpy change for the
entire process described in both parts a and b?
Explanation / Answer
We Know that : a ) Q1 = ms t = 3mole x 18 gm / mole x 2.050 J / gm K x ( 373 -273 ) K = 11070 J S = Q / T = 11070 J / 373 K = 29.678 J / K Q2 = mass of the substance x heat of vapourization of the water = 3 mole x 18 gm / mole x 2259.36 J = 122005.44Joule S = Q2 / T = 122005.44joule / 373 K = 327.09 J / K Total heat change = Q1 + Q2 = 133075.44 Joule Totalchange in Entropy = S1 + S2 = 356.768 J/ K Similarly , we can calculatethe second part of the question.Related Questions
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