na alculator Periodic Question 1 of 1 Sapling Learning macmillan leaming this qu

Question

na alculator Periodic Question 1 of 1 Sapling Learning macmillan leaming this question was written by Gen Chem Lab Coordinator at Western Washington University (V Butanol is being actively researched as an automotive biofuel. When this fuel is fully oxidized, the reaction produces CO2 (Rxn 1). However, if insufficient oxygen is supplied the carbon is only oxidized to CO (Rxn 2) Tip: If you need to clear you work and start over, click the button that looks like two red arrows 2C Rxn 2: |C,H,OH(I) + 20,(g) 2C Balance the equations above and answer the following questions How many moles of oxygen gas are required to partially oxidize 0.528 mol of butanol (Rxn 2)? + 3H, o Number 1.06 mol Compare the incomplete and complete combustions reactions. Based on reacting 0.528 mol of butanol fuel combustions? much more oxygen gas is required for complete combustion relative to incomplete Number Number Express the answer in moles of additional gas Express the answer as a % increase of O2 compared to incomplete combustion .52 mol 50

Explanation / Answer

complete combustion

C4H9OH (l) + 6 O2(g) -------------> 4CO2 (g) + 5H2O(g)

For incomplete combustion

C4H9OH (l) + 4 O2(g) -------------> 4CO (g) + 5H2O(g)

these are the balanced equations

Q1) when we start with 0.528 mol of butanol

using rxn2, incomplete combustion,

1 mol of butanol needs 4 mol of O2

0.528 mol requires 4x0.528 =2.112 mol of O2 gas

Q2)For the complete combustion form the balanced equation

1 mol of butanol takes 6 moles of O2 gas

0.528 mol requires = 6x 0.528 mol

= 3.168 mol of O2 gas

the excess oxygen required for complete combustion compared to incomplete oxidation is

= 3.168 -2.112 =1.056 mol of O2 gas

Q3)% increase of O2 compared to incomplete combustion is given as

% increase = increase in mol x 100/ moles for incomplete combustion

= 1.056 x100/2.112

= 50%

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