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What would be percentage composition by volume of
P a mixture of \( \mathrm{CO} \) and \( \mathrm{CH}_{4} \), whose \( 10.5 \mathrm{~mL} \) requires 9

W \( \mathrm{mL} \) oxygen for complete combustion?
(1) \( \mathrm{CO}=80 \% \quad \mathrm{CH}_{4}=20 \% \)
(2) \( \mathrm{CO}=90 \% \quad \mathrm{CH}_{4}=10 \% \)
(3) \( \mathrm{CO}=76.2 \% \quad \mathrm{CH}_{4}=23.8 \% \)
(4) \( \mathrm{CO}=66 \% \quad \mathrm{CH}_{4}=34 \% \)
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