A mixture of C3H8(g) & O2 having total volume 100 ml in an Eudiometry tube is sparked & it is observed that a contraction of 45 ml is observed what can be the composition of reacting mixture.
A
15mlC3H8 & 85mlO2
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B
25mlC3H8 & 75mlO2
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C
45mlC3H8 & 55mlO2
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D
55mlC3H8 & 45mlO2
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Solution
The correct options are A15mlC3H8 & 85mlO2 C25mlC3H8 & 75mlO2 C3H8(g)+5O2(g)→3CO2(g)+4H2O(l) 1 mole of porpane reacts with 5 moles of oxygen to form 3 moles of carbon dioxide. The number of moles is directly proportional to the volume of the gas. Thus when 15 ml of propane reacts with 75 ml of oxygen, 45 ml of carbon dioxide will be obtained. The contraction in the volume will be 15+75−45=45ml. This is possible when the composition of the reacting mixture is either 15mlC3H8and85mlO2 or 25mlC3H8and75mlO2. Hence, options A and B are the correct answers.