CIE Nov 2016 v1 Paper 2 Q1

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Answer all the questions in the spaces provided. PMT A 0.17 g sample of a Group 14 chloride, XCl 4, reacted with water to produce an oxide, XO2, and HCl. equation 1 XCl 4(s) + 2H2O(l)XO2(s) + 4HCl (aq) The HCl produced was absorbed in 100 cm3 of 0.10 mol dm3 sodium hydroxide solution (an excess). In a titration, the unreacted sodium hydroxide solution required 30.0 cm3 of 0.20 mol dm3 hydrochloric acid for complete neutralisation. (a) Calculate the amount, in moles, of hydrochloric acid used in the titration to neutralise the unreacted sodium hydroxide solution. amount =mol [1] (b) Write the equation for the reaction between hydrochloric acid and sodium hydroxide.[1] (c) Calculate the amount, in moles, of sodium hydroxide neutralised in the titration. (d) Calculate the amount, in moles, of sodium hydroxide that reacted with the HCl produced by the reaction in equation 1. amount =mol [1] (e) Calculate the amount, in moles, of HCl produced by the reaction in equation 1. amount =mol [1] amount =mol [1]UCLES 2016 9701/21/O/N/16<br /> (f) Calculate the amount, in moles, of XCl 4 in the original 0.17 g sample. PMT (g) Calculate the molecular mass, Mr, of XCl 4. amount =mol [1] Mr =[1] (h) Calculate the relative atomic mass, Ar, of X and suggest its identity. Ar of X =identity of X[2] [Total: 9]UCLES 2016 9701/21/O/N/16 [Turn over<br />

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