Zadanie 4e
Ethene reacts with water in the presence of an acid catalyst at room temperature. C2H4(g) + H2O(l) → C2H5OH(l) ΔH⊖ = −44 kJ mol−1 (i) Calculate the change in entropy, ΔS⊖, for this reaction in…
Entropy and spontaneity
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 46 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 31 z 54 arkuszy w bazie.
Zadania z tego działu: 46 Otwórz w wyszukiwarce z filtrami
Zadanie 4b
Propane undergoes complete combustion. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) (i) Calculate the standard enthalpy change of reaction, ΔH⊖, in kJ mol−1, for the combustion of propane. Use section 13 of the data booklet. (ii)…
Zadanie 22
In which reaction will there be a decrease in entropy? A. NH4NO3(s) → NH4NO3(aq) B. CaCO3(s) → CaO(s) + CO2(g) C. 2 H2(g) + O2(g) → 2 H2O(l) D. N2O4(g) → 2 NO2(g)
Zadanie 22
Under which temperature conditions is ΔG⊖ negative for this reaction? CaCO3(s) → CaO(s) + CO2(g) ΔH⊖ = +178 kJ mol−1 A. Low temperatures only B. High temperatures only C. Any temperatures D. No temperatures
Zadanie 5a
(i) Calculate, in kJ mol−1, the standard enthalpy change of this hydrogenation reaction using the enthalpy of combustion data in section 14 of the data booklet. (ii) The standard entropy change for this reaction is…
Zadanie 21
Which change results in a decrease in entropy? A. 2 NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g) B. I2(s) → I2(g) C. CO(g) + 2 H2(g) → CH3OH(l) D. KNO3(s) → KNO3(aq)
Zadanie 22
Which condition applies to a reaction mixture that has reached equilibrium at constant temperature and pressure? A. ΔH = 0 B. ΔG = 0 C. K = 1 D. ΔSsystem = 0
Zadanie 23
For which of these changes is ΔS negative? A. 2 SO2(g) + O2(g) → 2 SO3(g) B. NaNO3(s) → NaNO3(aq) C. Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) D. CuCO3(s) → CuO(s) + CO2(g)
Zadanie 24
A reaction is spontaneous at low temperatures but becomes non-spontaneous when the temperature is raised. Which combination of signs of ΔH and ΔS is consistent with this behaviour? A. ΔH > 0 and ΔS > 0 B. ΔH < 0 and…
Zadanie 25
Which reaction has the largest positive entropy change? A. 2 SO2(g) + O2(g) → 2 SO3(g) B. NH4Cl(s) → NH3(g) + HCl(g) C. H2(g) + Cl2(g) → 2 HCl(g) D. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)