12.1. Nitrogen and sulfur
A subsection of Chemistry, 9701, through 12. Nitrogen and sulfur
Listing 10 of 350 questions
State one natural and one man-made occurrence of oxides of nitrogen. Under conditions of high pressure and a catalyst, nitrogen monoxide, NO, forms two other oxides of nitrogen, dinitrogen monoxide, N2O, and dinitrogen trioxide, N2O3. NON2O+ N2O3ΔH o = –195.2 kJ mol–1 ΔG o = –102.8 kJ mol–1 Balance the equation above for the formation of N2O and N2O3 from NO. State how the oxidation number of nitrogen changes during this reaction. NO N2O from to NO N2O3 from to  Calculate the entropy change for the reaction at 298 K. Include the units in your answer.  ΔS o =  units =  State whether the sign of ΔS o calculated in agrees with that predicted from your balanced equation in . Explain your answer. At room temperature N2O3 dissociates. N2O3NO+ NO2Write the expression for Kp for this equilibrium. Include the units in your answer. Kp =  units =  A 1.00 dm3 flask at 25 °C is filled with pure N2O3at an initial pressure of 0.60 atm. At equilibrium, the partial pressure of NO2is 0.48 atm. Calculate the partial pressures of NOand N2O3at equilibrium. Hence calculate the value of Kp at 25 °C. p(NO) = p(N2O3) =  Kp =  NO reacts readily with oxygen. 2NO+ O22NO2The table shows how the initial rate of this reaction at 25 °C depends on the initial concentrations of the reactants. initial concentration / mol dm–3 initial rate / mol dm–3 s–1 0.100 0.0500 3.50 0.0500 0.100 1.75 0.0500 0.0500 0.875 Deduce the order of reaction with respect to each reactant. Explain your reasoning. order with respect to order with respect to  State the rate equation for this reaction. Use the rate equation to calculate the rate constant. Include the units for the rate constant in your answer. rate =  rate constant, k =  units of k =  NO reacts with iron pentacarbonyl, Fe(CO)5, as shown. NO and CO are both monodentate ligands. Fe(CO)5 + 2NO Fe(CO)2(NO)2 + 3CO During this reaction the co-ordination number of the iron changes. State what is meant by the term co-ordination number. Describe how the co-ordination number of the iron changes during this reaction. from to  Only one stereoisomer of Fe(CO)2(NO)2 exists. Use this information to suggest the geometry of the complex. The complex Ru(NO)L2Cl 3 exists in three isomeric forms. L represents the monodentate ligand C6H5P(CH3)2. Complete the three-dimensional diagrams to show the three isomers of Ru(NO)L2Cl 3. L Ru NO L Ru NO L Ru NO  Suggest the type of isomerism shown. 
9701_m19_qp_42
THEORY
2019
Paper 4, Variant 2
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