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When 12g graphite is burnt in sufficient...

When `12g` graphite is burnt in sufficient oxygen, `CO` as well as `CO_(2)` is formed. If the product contains `40%` `CO` and `60%` `CO_(2)` by mass and none of the reactant is left, what is the mass of oxygen gas used in combustion?
`26.0g`
`21.33g`
`23.8g`
`15.6g`

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