The following experiment was performed in order to
determine the formula of a hydrocarbon. The hydrocarbon
X is purified by fractional distillation.
0.145 g of X were heated with dry copper (II) oxide and
224 cm³ of carbon dioxide was collected at STP.
(a) Which elements does X contain ?
(b) What was the purpose of Copper (II) oxide ?
(c) Calculate the empirical formula of X by the following
steps:
(i) Calculate the number of moles of carbon dioxide
gas.
(ii) Calculate the mass of carbon contained in this
quantity of carbon dioxide and thus the mass of
carbon in sample X.
(iii) Calculate the mass of hydrogen in sample X.
(iv) Deduce the ratio of atoms of each element in X (empirical formula)
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