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25 " mL of " a mixture of Co, CO(2) and ...

25 " mL of " a mixture of Co, `CO_(2)` and `H_(2)` were exploded mL with 10 " mL of " oxygen. The products has a volume of 18.5 " mL of " which 17 mL absorbed by alkali. What was the composition of the original mixture? All volume measurements were made at the same temperature and pressure?

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