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Consider the following reaction at 298 K: C(graphite)+2CL(g)------> CCl4(l) delta H=-139 kj Calculate delta S sys...

Consider the following reaction at 298 K: C(graphite)+2CL(g)------> CCl4(l) delta H=-139 kj

Calculate

delta S sys

delta S surr

delta S univ

Solutions

Expert Solution

entropy data ( J/mole.K) : C ( graphite) : 5.7 Cl2 (g):223.81: CCl4 : 216.4

the reaction is C(graphite)+ 2Cl2(g) ------>CCl4(l)

entropy change = Sum of entropy of products- { sum of entropy of reactants}

1, 2 and 1 are coefficients of CCl4(l), Cl2(g), C(graphite)

= 1*216.4-{1* 5.7+2*223.81}=-236.92 J/mole.K

Since during the reaction, enthalpy change is -ve suggesting that heat is evolved and surroundings gain entropy

entropy change of surroundings= +139*1000/298.15=466.21 J/Mole.K

entropy change of universe= entropy change of surroundings+ entropy change because of reaction =466.21-236.92 =229.29 J/mole.K

queen_honey_blossom answered 2 years ago
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