1. When 0.42 g of a gaseous hydrocarbon A is slowly passed over a large quantity of heated copper(II) oxide, CuO, A is completely oxidised. The products are collected and it is found that 1.32 g of CO2 and 0.54 g of H2O are formed. Copper is the only other product of the reaction. (a) (i) Calculate the mass of carbon present in 1.32 g of CO2. Use this value to calculate the amount, in moles, of carbon atoms present in 0.42 g of A. (ii) Calculate the mass of hydrogen present in 0.54 g of H2O. Use this value to calculate the amount, in moles, of hydrogen atoms present in 0.42 g of A. (iii) It is thought that A is an alkene rather than an alkane. Use your answers to (i) and (ii) to deduce whether this is correct. Explain your answer. .................................................................................................................................. ............................................................................................................................. [5]
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0
Explanation:
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found in oct/nov 2011 -
9701/23
Paper 2 AS structured question
Explanation:
(i) mass of C = 12 × 1.32 = 0.36g
44
n(C) = 0.36 = 0.03
12
(ii) mass of H = 2 × 0.54 = 0.06 g
18
n(H) = 0.06 = 0.06
1
(iii) Yes, because 0.03 mol of C are combined with 0.06 mol of H / empirical formula is CH2
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