Apply Hess's law that the enthalpy change is independent of the route, and combine given equations (reversing, scaling and adding them) or construct an energy cycle to calculate the enthalpy change of a reaction that cannot be measured directly.
Tę umiejętność sprawdza 13 zadań wzorowanych na arkuszach IB z lat 2022–2026.
(i) Sulfur dioxide is oxidized to sulfur trioxide by nitrogen dioxide in the atmosphere. Determine the enthalpy change, ΔH⊖, in kJ mol−1, for the reaction SO2(g) + NO2(g) → SO3(g) + NO(g) given these reactions and enthalpy…
State the overall reaction of the cycle and determine its enthalpy change, in kJ mol−1.
Given the following data: CaO(s) + CO2(g) → CaCO3(s) ΔH = −p kJ 2 Ca(s) + O2(g) → 2 CaO(s) ΔH = −q kJ 2 CaCO3(s) → 2 Ca(s) + 2 C(s) + 3 O2(g) ΔH = +r kJ What is the ΔH of the…
The Born–Haber cycle for the formation of potassium fluoride, KF, is shown. What is the enthalpy of formation of potassium fluoride, KF, in kJ mol-1? A. −490 B. +86.5 C. +1088.5 D. −569.5
The standard enthalpy changes of two reactions are given below. N2(g) + O2(g) → 2 NO(g) ΔH⊖ = x kJ mol−1 2 NO(g) + O2(g) → 2 NO2(g) ΔH⊖ = y kJ mol−1 What is ΔH⊖, in…
Methanol can be synthesized from carbon monoxide and hydrogen: CO(g) + 2 H2(g) → CH3OH(l) What is the enthalpy change for the synthesis of liquid methanol, in kJ mol−1? A. +129 B. −53 C. −129 D. −1581
Use the data below, together with sections 9 and 12 of the data booklet, to determine the lattice enthalpy of potassium iodide. K(s) → K(g) ΔH = +89 kJ mol−1 I2(s) → I2(g)…
Standard enthalpy changes of reaction are provided for the following reactions. C(s) + O2(g) → CO2(g) ΔH⊖ = −394 kJ…
Consider the following equations. H2(g) + Cl2(g) → 2 HCl(g) ΔH⊖ = −x kJ C(s) + 2 Cl2(g) → CCl4(g) ΔH⊖ = −y kJ 2 C(s) + H2(g) → C2H2(g) ΔH⊖ = +z kJ What…
What is the enthalpy change for the following reaction? CO2(g) + 4 H2(g) → CH4(g) + 2 H2O(l) A. +75 + 572 − 394 B. −75 − 572 − 394 C. +75 − 572 + 394 D. −75 − 572 + 394
Which expression gives the value of ΔH⊖, in kJ, for the formation of one mole of NO2(g) from its elements, ? A. −180 + 114 B. 0.5 × (−180) + 0.5 × 114 C. 0.5 × 180 − 0.5 × 114 D. 0.5 × 180 + 0.5 × 114
Which calculation gives the standard enthalpy change of formation of nitrogen monoxide, in kJ, from the data below? A. (+66) + (−114) B. 0.5 × (+66) + 0.5 × (−114) C. (+66) − (−114) D. 0.5 × (+66) − 0.5 × (−114)
What is the enthalpy of formation of ethane, C2H6(g), calculated from the enthalpies of combustion below? C(s) + O2(g) → CO2(g), ΔH = −394 kJ mol−1 , ΔH = −286 kJ mol−1…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.