A block of copper ata a temperature of 60 degree C is placed in contact with a b

Question

A block of copper ata a temperature of 60 degree C is placed in contact with a block of aluminium ata atemperature of 43 degree C in an insulated container. As a result of a transfer of 1035 J of energy from the copper to the aluminum, the final equilubrium, temperature of the two blocks is 48 degree C What is the approximate change in the entropy of the aluminium block J/k What is the approximate change in the entropy of the copper block J/k What is the approximate change in the entropy of the Universe J/k

Explanation / Answer

a)

entropy dS = dQ/T

S = integration dS = Q*ln*(T2/T1)

T1 = 43+273 = 316 k

T2 = 48+273 = 321 K

S1 = 1035*ln(321/316)

s1 = 16.25 J/K

(b)

T1 = 60+ 273 = 333 K

S1 = 1035*ln(321/333) = -38

(c)

S = s1 + s2 = 52.25 J/K

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