Which of the following transformations represent an increase in the entropy of t

Question

Which of the following transformations represent an increase in the entropy of the system. Choose all that apply

31 g C2H5OH (liquid, 171K)31 g C2H5OH (liquid, 340K)

3 mol Ne (0.593 atm, 410K)3 mol Ne (0.593 atm, 205K)

3 mol Xe (9.52 L, 228K)3 mol Xe (19.0 L, 228K)

31 g C2H5OH (liquid, 352K)31 g C2H5OH (gas, 352K)

29 g Sb (liquid, 904.0K)29 g Sb (solid, 904.0K)

Predict whether S for each reaction would be greater than zero, less than zero, or too close to zero to decide.

N2(g) + O2(g)2NO(g)

COCl2(g)CO(g) + Cl2(g)

2HBr(g) + Cl2(g)2HCl(g) + Br2(g)

CO(g) + 3H2(g)CH4(g) + H2O(g)

CaCO3(s)CaO(s) + CO2(g)

For which of the following reactions is S° > 0. Choose all that apply.

2H2O(g) + 2Cl2(g) 4HCl(g) + O2(g)

H2CO(g) + O2(g) CO2(g) + H2O(l)

2NH3(g) + 3N2O(g)  4N2(g) + 3H2O(g)

NH4HS(s)  NH3(g) + H2S(g)

CO(g) + Cl2(g)  COCl2(g)

Explanation / Answer

1) 31 g C2H5OH (liquid, 171K)31 g C2H5OH (liquid, 340K)

3 mol Xe (9.52 L, 228K)3 mol Xe (19.0 L, 228K)

31 g C2H5OH (liquid, 352K)31 g C2H5OH (gas, 352K)

2) N2(g) + O2(g)2NO(g) greater than zero

COCl2(g)CO(g) + Cl2(g) greater than zero

2HBr(g) + Cl2(g)2HCl(g) + Br2(g) too close to zero

CO(g) + 3H2(g)CH4(g) + H2O(g) less than zero

CaCO3(s)CaO(s) + CO2(g) greater than zero

3) 2H2O(g) + 2Cl2(g) 4HCl(g) + O2(g)

2NH3(g) + 3N2O(g)  4N2(g) + 3H2O(g)

NH4HS(s)  NH3(g) + H2S(g)

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