Define standard enthalpy of formation and standard enthalpy of combustion, write the equation each refers to (one mole of compound formed from elements in standard states, or one mole of substance burned completely) and look up values in the data booklet.
Tę umiejętność sprawdza 12 zadań wzorowanych na arkuszach IB z lat 2023–2026.
(i) Determine the enthalpy of combustion of pentane, in kJ mol−1, using table 12 in the data booklet. C5H12(g) + 8 O2(g) → 5 CO2(g) + 6 H2O(g) (ii) Calculate the mass, in g, of carbon dioxide, CO2, produced when 45.0 g of pentane react with…
State the overall reaction of the cycle and determine its enthalpy change, in kJ mol−1.
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
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,…
Calculate the rise in temperature of 400.0 cm3 of water heated by the complete combustion of 2.00 g of butan-1-ol, assuming that all the energy released is transferred to the water. Use sections 2 and 14 of the data booklet.
Which equation represents both the standard enthalpy of formation, ΔHf⊖, of a compound and the standard enthalpy of combustion, ΔHc⊖, of an element? A. B.…
(i) Using section 12 of the data booklet, determine the standard enthalpy change of the reaction, in kJ mol−1. (ii) A value obtained from bond enthalpies is less accurate than one obtained from enthalpies of formation. State two reasons why.…
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
Which expression can be used to calculate the standard enthalpy change of a reaction, ΔH⊖, from standard enthalpies of combustion? A.…
Glucose, C6H12O6, is oxidized in the body by respiration to carbon dioxide and water. The standard enthalpy of combustion of glucose is −2803 kJ mol−1. Determine the energy, in kJ, released by the complete oxidation of 12.5 g of glucose.
The standard enthalpy change of formation of hydrogen chloride gas is −92 kJ mol−1. How much energy, in kJ, is released in the following reaction? H2(g) + Cl2(g) → 2 HCl(g) A. 46 B. 92 C. 368 D. 184
Hexane is a component of petrol. The equation for its combustion is: Determine the mass of carbon dioxide, in g, released for every 1 kJ of energy produced by the combustion of hexane. Use section 14 of the data…
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