A gas mixture of \( 3 \mathrm{~L} \) of propane and butane on complete combustion at \( 25^{\cir...

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A gas mixture of \( 3 \mathrm{~L} \) of propane and butane on complete combustion at \( 25^{\circ} \mathrm{C} \) produces \( 10 \mathrm{~L} \) of
P \( \mathrm{CO}_{2} \). Initial composition of the propane \& butane in the gas mixture is -
(1) \( 66.67 \%, 33.33 \% \)
(2) \( 33.33 \%, 66.67 \% \)
(3) \( 50 \%, 50 \% \)
(4) \( 60 \%, 40 \% \)
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