Hess's law with formation and combustion data

Chemia IBPaper 2, maj 2026, TZ3wzorowane6 pktobliczenioweśrednie (szac.)

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)…

Chemia IBPaper 2, maj 2026, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 5a

State the overall reaction of the cycle and determine its enthalpy change, in kJ mol⁻¹.

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 23

Which expression gives the standard enthalpy change of hydrogenation of propyne, in kJ mol⁻¹? CH₃C≡CH(g) + 2 H₂(g) → CH₃CH₂CH₃(g) A. −1937 − (2 × 286) + 2220 B. −2220 + 1937 + (2 × 286) C. −1937 − 286 + 2220 D. −1937 + 2220

• Tabela do uzupełnienia

Chemia IBPaper 2, maj 2025, TZ3wzorowane4 pktobliczeniowetrudne (szac.)

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…

Chemia IBPaper 2, maj 2025, TZ1wzorowane6 pktobliczenioweśrednie (szac.)

Zadanie 8f

trans-But-2-ene reacts with hydrogen in the presence of a nickel catalyst to form butane. C₄H₈(g) + H₂(g) → C₄H₁₀(g) (i) Calculate, in kJ, the enthalpy change of this reaction from the bond enthalpies in section 12 of the data booklet. (ii) Calculate,…

Chemia IBPaper 1A, maj 2025, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 24

The table shows standard enthalpies of combustion. Which expression gives the enthalpy change, in kJ mol⁻¹, of the following cracking reaction? C₄H₁₀(g) → C₃H₆(g) + CH₄(g) A. −2878 + 2058 + 891 B. −2058 − 891 + 2878 C.…

• Tabela do uzupełnienia

Chemia IBPaper 2, listopad 2025, TZ1wzorowane15 pktobliczeniowetrudne (szac.)

Zadanie 3d

(i) Calculate the enthalpy change, ΔH, for the overall synthesis of propyl ethanoate from propane and ethane shown above. Use section 12 of the data booklet. (ii) Two students each calculated the enthalpy change for the reaction between propan-1-ol and…

• Materiał graficzny

Chemia IBPaper 1A, listopad 2025, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 21

What is the enthalpy change, in kJ mol⁻¹, for the formation of methanol from carbon monoxide and hydrogen? CO(g) + 2 H₂(g) → CH₃OH(l) A. −726 + 2(−286) − 283 B. −283 + 2(−286) + 726 C. −283 − 2(−286) + 726 D. −726 − 2(−286) − 283

• Tabela do uzupełnienia

Chemia IBPaper 2, specimen 2025wzorowane9 pktobliczeniowetrudne (szac.)

Zadanie 5d

Pentadecane can be cracked into smaller molecules. Consider the reaction: C₁₅H₃₂(g) → 3 C₄H₈(g) + C₃H₈(g) where C₄H₈ is but-1-ene. (i) Use the bond enthalpies in section 12 of the data booklet to determine ΔH^⊖ for this reaction.…

Chemia IBPaper 2, maj 2024, TZ2wzorowane4 pktobliczenioweśrednie (szac.)

Zadanie 5c

Propenal can be made by the dehydration of propane-1,2,3-triol (glycerol). CH₂(OH)CH(OH)CH₂OH(l) → CH₂=CHCHO(g) + 2 H₂O(g) (i) Calculate the standard enthalpy change of this reaction, using ΔH_f^⊖ of propenal(g)…

Chemia IBPaper 1, maj 2024, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 15

Which expression can be used to calculate the standard enthalpy change of a reaction, ΔH^⊖, from standard enthalpies of combustion? A.…

Chemia IBPaper 1, maj 2024, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 17

Standard enthalpy changes of reaction are provided for the following reactions. C(s) + O₂(g) → CO₂(g)  ΔH^⊖ = −394 kJ…

Chemia IBPaper 2, listopad 2024wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 3e

Calcium reacts with water to form calcium hydroxide solution and hydrogen gas. Ca(s) + 2 H₂O(l) → Ca(OH)₂(aq) + H₂(g) (i) Calculate the enthalpy change, in kJ, when 5.00 g of calcium reacts completely with water. Use section 13 of the data booklet.…

Chemia IBPaper 2, maj 2023, TZ2wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 2a

In air, sulfur dioxide can be oxidized to sulfur trioxide. The reaction is reversible, and at high temperature it reaches equilibrium in a closed container. 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) (i) At 600 °C the equilibrium constant, K, for this reaction is…

• Tabela do uzupełnienia

Chemia IBPaper 2, maj 2023, TZ1wzorowane4 pktotwarteśrednie (szac.)

Zadanie 6a

Hydrogen sulfide, H₂S, is removed from natural gas by burning it in air to form sulfur dioxide. (i) Determine the standard enthalpy change of reaction, ΔH^⊖, in kJ mol⁻¹, for 2 H₂S(g) + 3 O₂(g) → 2 SO₂(g) + 2 H₂O(l),…

• Tabela do uzupełnienia

Chemia IBPaper 2, listopad 2023, TZ1wzorowane7 pktobliczeniowetrudne (szac.)

Zadanie 4a

(i) Calculate the enthalpy change of this reaction using section 13 of the data booklet together with the values given below: (ii) Outline why the entropy change of this reaction is expected to be small. (iii) Ignoring any entropy change, estimate the…

• Tabela do uzupełnienia

Chemia IBPaper 2, listopad 2023, TZ2wzorowane7 pktobliczeniowetrudne (szac.)

Zadanie 4a

(i) Calculate the enthalpy change for this reaction, using section 13 of the data booklet and the values given below. (ii) Outline why the entropy change of this reaction is expected to be small. (iii) Ignore the entropy change. Use your answer to (i) together…

• Tabela do uzupełnienia

Chemia IBPaper 2, maj 2022, TZ1wzorowane6 pktobliczenioweśrednie (szac.)

Zadanie 3b

The enthalpy change of the reaction is one factor that influences the position of equilibrium. (i) Determine the enthalpy change, ΔH, for the production of methanol, in kJ, using bond enthalpies. Use section 12 of the data booklet. (ii) Outline why a…

• Materiał graficzny

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 15

What is the enthalpy change for the following reaction? CH₂=CHCH₃ + HCl → CH₃CHClCH₃ A. +73.0 kJ B. −73.0 kJ C. −165.3 kJ D. −216.8 kJ

• Tabela do uzupełnienia

Chemia IBPaper 2, listopad 2022wzorowane10 pktotwarteśrednie (szac.)

Zadanie 1f

Solid ammonium chloride decomposes when heated to form two gases, ammonia and hydrogen chloride. (i) Write the chemical equation for this decomposition. (ii) Calculate the volume of ammonia produced at STP when an 8.00 g sample of ammonium chloride decomposes.…

Chemia IBPaper 1, listopad 2022wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 14

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 $\ce{H2(g) + 1/2O2(g) -> H2O(l)}$, ΔH = −286 kJ mol⁻¹…