A gas mixture of 3 litres of propane and butane on complete combustion at 25oC produced 10 litres of CO2. The gas mixture contains initally :
A
2 litres C3H8+1 litre C4H10
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B
1 litres C3H8+2 litres C4H10
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C
1.5 litres C3H8+1.5 litres C4H10
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D
2.5 litres C3H8+0.5 litre C4H10
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Solution
The correct option is A2 litres C3H8+1 litre C4H10 The balanced reactions are given below: C3H8+5O2→3CO2+4H2O a C4H10+132O2→4CO2+5H2O b ∴a+b=3 ...(i) Volume of CO2 formed =3a+4b ∴3a+4b=10 ...(ii) By eqs. (i) and (ii) ,b=1 and a=2
Hence, the gas mixture contains initially 2 L of C3H8 and 1 L of C4H10.