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Thermodynamics Numerical

1.Copper melts at 1083°C and its heat of fusion is 12.97 kJ/mol. Calculate the change of entropy at melting point in (J/mol-k.)

10.5
8.5
9.56
12.97
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2.Determine the heat flow across a plane wall of 10 cm thickness with a constant thermal conductivity of 8.5 W/m-K when the surface temperatures are steady at 100°C and 30°C. The wall area is 3m2 .

46.85 kW
17.85 kW
34.67 kW
55.99 kW
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3.At what temperature will the diffusion coefficient for the diffusion of zinc in copper have a value of 2.6 × 10 -16 m2 /s Do =2.4 × 10 -5 m2 /s Qd =189 KJ/mol.

628 K
901 K
370 K
500 K
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4.Determine the heat transfer by convection over a surface of 0.5 m 2 area if the surface is at 160°C and fluid is at 40°C. The value of convective heat transfer coefficient is 25 W/m2 K

1500 kW
2.56 kW
1.5 kW
15 kW
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5.Calculate the entropy increase in (J/mol-k) when one mole of ice melts into water at 0°C. The latent heat of fusion of ice, ∆H = 6.02 kJ/mol

22.04
34
13
40
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6.Two moles of a monatomic ideal gas are contained at a pressure of 1 atm and a temperature of 300 K. 34,166 joules of heat are transferred to the gas, as a result of which the gas expands and does 1216 joules of work against its surroundings. The process is reversible. Calculate the final temperature of the gas. in ( Kelvin)

1347
1400
1620
1200
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7.One mole of monatomic ideal gas is reversibly and isothermally expanded at 1000 K to twice its original volume. The work done by the gas in Joules is

2430
2503
5006
5763
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