CIE Jun 2013 v3 Paper 2 Q1

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Examiners For Use Answer all the questions in the spaces provided. Carbon disul de, CS2, is a volatile,ammable liquid which is produced in small quantities in volcanoes. (a) The sequence of atoms in the CS2 molecule is sulfur to carbon to sulfur. (i) Draw a dot-and-cross diagram of the carbon disul de molecule. Show outer electrons only. (ii) Suggest the shape of the molecule and state the bond angle. shapebond angle[3] (b) Carbon disul de is readily combusted to give CO2 and SO2. (i) Construct a balanced equation for the complete combustion of CS2.(ii) De ne the term standard enthalpy change of combustion, .[3]UCLES 2013 9701/23/M/J/13<br /> Examiners For Use (c) Calculate the standard enthalpy change of formation of CS2 from the following data. Include a sign in your answer. standard enthalpy change of combustion of CS2 = 1110 kJ mol1 standard enthalpy change of formation of CO2 = 395 kJ mol1 standard enthalpy change of formation of SO2 = 298 kJ mol1 [3] (d) Carbon disul de reacts with nitrogen monoxide, NO, in a 1:2 molar ratio. A yellow solid and two colourless gases are produced. (i) Construct a balanced equation for the reaction.(ii) What is the change in the oxidation number of sulfur in this reaction? fromto[3] [Total: 12]UCLES 2013 9701/23/M/J/13 [Turn over<br />

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