1. For which process is DS negative? Condensation of 1 mol of CHO3(g) mbing 15 m

Question

1. For which process is DS negative? Condensation of 1 mol of CHO3(g) mbing 15 mL ethanol with 5 mL water 1 mol hydrogen gas expands at constant temperature from 0.5 liters to 1.0 lter The temperature of 100 g silver changes from 275 K to 295 K Decomposition of dinitrogen tetroxide gas into nitrogen dioxide gas at constant temperature. O The temperature of 100g siver changes from 275 K to 295s 2. In which reaction is DS° expected to be positive? 212s) 2H20(g) - 2H2(g)+02(g) CH4(g) + 2 O2(g) --> CO2(g) + 2 H20(1) 4 NH3(aq) Cu2+(aq)> Cu(NH3)42+(aq) 04 3. The second law of thermodynamics states that 0 The energy of the universe is conserved. The entropy of the universe is conserved. The total enthalpy of the universe is increasing. The total entropy of the universe is increasing. 4. Which of the following statements is always true for a spontaneous process? I. DSsy> 11. DSun > 0 III. DSsurr>0 I only II only I and II I and III III only

Explanation / Answer

dS is entropy which is associated with disorder (increase in gas)

If dS is negative, this means the system is becoming more ordered...

1)

Condensation takes moles of gas(disorder) into a more ordered state (liquid)

2)

2H2O(g) --> 2H2(g)+O2(g)

since 2 mol of gas form 3 mol of gas, therefore increases disorder, that is dS > 0

3)

Secon law of thermodynamics is about disorder and chaos, that is, entropy. The entropy of the UNIVERSE increases

4)

For a spontaneous process

only dSuniverse > 0 (as stated in 3, in the 2nd law of thermod)

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