12. Consider a block of iron of mass 475 g and initially at 283 K. The block is in contact with a nearly massless electr

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12 Consider A Block Of Iron Of Mass 475 G And Initially At 283 K The Block Is In Contact With A Nearly Massless Electr 1 (93.77 KiB) Viewed 42 times

12. Consider a block of iron of mass 475 g and initially at 283 K. The block is in contact with a nearly massless electric heater of resistance 1.00 kn and is subjected to a current of 1.00 A for 16.6 s. T/K a) b) T/K Calculate the change in entropy of the metal. See prescribed textbook for the molar heat capacity at constant pressure. [3] 13. Consider the variance of molar heat capacity for anhydrous potassium hexacyanoferrate (II) with temperature in the following table and determine the Third-Law molar entropy at 200 K. [6] Calculate the total change in entropy when the block is instead held under a stream of water at 293 K. [2] 10 20 100 Cp.m/JK-¹mol-1 2.09 14.43 36.44 62.55 30 110 40 150 160 50 87.03 170 Cp.m/JK-¹mol-1 179.6 192.8 237.6 247.3 256.5 60 111.0 180 70 190 80 131.4 149.4 165.3 265.1 273.0 200 90 280.3