Edexcel Jun 2014 Paper 5 Q19

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Answer ALL the questions. Write your answers in the spaces provided. SECTION B 19 A compound A, known to contain only the elements carbon, hydrogen and oxygen, was subjected to detailed analysis. (a) A sample of A was burned completely in the apparatus shown below. Solid X absorbed the water formed in the combustion and solid Y absorbed the carbon dioxide. compound A dry oxygen suction heat solid X (i) Explain why the oxygen must be dry. solid Y (1)(ii) Suggest a suitable substance to use as solid X. (1)(iii) Suggest a suitable substance to use as solid Y. (1)10 *P42973A01028*<br /> (iv) 3.60 g of compound A was burned completely. The mass of solid X increased by 3.60 g and the mass of solid Y increased by 8.80 g. Use these data to calculate the empirical formula of compound A. You must show your working. (5) *P42973A01128* 11 Turn over<br /> (b) The mass spectrum of A is shown below. Relative intensity 100 80 60 40 20 10 20 30 40 50 60 70 80 m / e 90 100 110 120 130 140 150 (i) Identify the molecular ion peak and hence deduce the molecular formula of A. (2)12 *P42973A01228*<br />

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