Consider the entropy change in the following chemical or physical processes:2 Na(s) + Cl2(g) → 2 NaCl(s)N2(g) + 3 H2(g) → 2 NH3(g)H2O(s) → H2O(l)C10H22(l) → C10H22(s)2 Mg(s) + O2(g) → 2 MgO(s)In which of these processes is entropy increased?Question 8Select one:Entropy is increased in # 3 only.Entropy is increased in #1, #4 and #5Entropy is increased in # 2 and # 3None. Entropy is decreased on all these processesEntropy is increased in all five processes
Question
Consider the entropy change in the following chemical or physical processes:2 Na(s) + Cl2(g) → 2 NaCl(s)N2(g) + 3 H2(g) → 2 NH3(g)H2O(s) → H2O(l)C10H22(l) → C10H22(s)2 Mg(s) + O2(g) → 2 MgO(s)In which of these processes is entropy increased?Question 8Select one:Entropy is increased in # 3 only.Entropy is increased in #1, #4 and #5Entropy is increased in # 2 and # 3None. Entropy is decreased on all these processesEntropy is increased in all five processes
Solution
Entropy is a measure of the disorder or randomness of a system. In general, entropy increases in processes where the number of gaseous molecules increases or when a solid or liquid becomes a gas.
-
2 Na(s) + Cl2(g) → 2 NaCl(s): The entropy decreases because we are going from one mole of gas and two moles of solid to two moles of solid.
-
N2(g) + 3 H2(g) → 2 NH3(g): The entropy decreases because we are going from four moles of gas to two moles of gas.
-
H2O(s) → H2O(l): The entropy increases because we are going from a solid to a liquid, which is a more disordered state.
-
C10H22(l) → C10H22(s): The entropy decreases because we are going from a liquid to a solid, which is a less disordered state.
-
2 Mg(s) + O2(g) → 2 MgO(s): The entropy decreases because we are going from one mole of gas and two moles of solid to two moles of solid.
So, the correct answer is "Entropy is increased in # 3 only."
Similar Questions
Which of the following process results in the increase in entropy of the surroundings?I) the cooling of a hot cup of coffee in room temperature airII) the evaporation of water from a desk at room temperatureIII) the melting of snow above 0 °CIV) the sublimation of dry ice (solid CO2)
Which reaction would cause a decrease in entropy?A.CO(g) + 3H2(g) CH4(g) + H2O(g)B.2NH3(g) N2(g) + 3H2(g)C.2NOCl(g) 2NO(g) + Cl2(g)D.2CCl4(g) + O2(g) 2COCl2(g) + 2Cl2(g)
Do all spontaneous reactions lead to an increase in entropy of the system? Justifyyour answer.
What happen to the entropy of H2O(l) → H2O(g).*decreases because of a phase change from a liquid to a gas.increases because of a phase change from a liquid to a gas.Either increases or decreases.Remains constant.
Which of the following reactions would have a decrease in entropy?A.2NH3(g) N2(g) + 3H2(g)B.2SO3(g) 2SO2(g) + O2(g)C.2H2O(g) 2H2(g) + O2(g)D.2NO2(g) N2O4(g)SUBMITarrow_backPREVIOUS
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.