A Level H2 Chemistry 2021 Paper 3 Answers Link

(Data provided typically includes bond energies). Answer: Equation: $\frac12\textN_2(\textg) + \frac32\textH_2(\textg) \rightarrow \textNH_3(\textg)$ Using Bond Energy data (approximate values from typical data booklet): $\Delta H_f = \sum \textBond Energies (Reactants) - \sum \textBond Energies (Products)$ $\Delta H_f = [\frac12(\textN\equiv\textN) + \frac32(\textH-\textH)] - [3(\textN-\textH)]$ Calculation: $\Delta H_f = [\frac12(994) + \frac32(436)] - [3(391)]$ $\Delta H_f = [497 + 654] - [1173] = 1151 - 1173 = -22 \text kJ mol^-1$.

was a base or that chloride ions were not the conjugate base of HClcap H cap C l A Level H2 Chemistry 2021 Paper 3 Answers

a) For the reaction: 2NO2(g) ⇌ N2O4(g), write an expression for the equilibrium constant Kc. Answer: Kc = [N2O4] / [NO2]^2 (Data provided typically includes bond energies)

: Discussions on isomeric effects under the influence of electrophilic substitution and the relative basicities of different nitrogen-containing compounds. Practical & Data Analysis : Answer: Kc = [N2O4] / [NO2]^2 : Discussions

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: Examiners noted common mistakes where students incorrectly identified NaClcap N a cap C l