Determine the molecular formula of the paraffin

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Reference no: EM13990525

An unknown paraffinic hydrocarbon is defined by the chemical formula C_xH_2x+2. The paraffin is burned with air, and there is no CO in the combustion products.

(a) Use a degree-of-freedom analysis to determine how many variables must be specified to determine the flow rates of all components entering and leaving the combustion unit. Express the fraction excess air as v and write elemental balances in terms of x, y. and the molar flow rate of C_xH_2x+2.

(b) Calculate the molar composition of the combustion product gas in terms of x for each of the following three cases: (i) theoretical air supplied (y = 0). 100% conversion of the paraffin; (ii) 20% excess air (y = 0.2), 100% conversion of the paraffin; (iii) 20% excess air. 90(-7( cons ersion of the paraffin.

(c) Suppose x = 3 (i.e. the paraffin is propane). Assuming complete combustion of the hydrocarbon, what is the ratio of CO₂ to H₂O in the product gas? Use this result to suggest a method for determining the molecular formula of the paraffin.

Reference no: EM13990525

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