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What is the lifetime of OH at the sea level, assuming that the following reactions are...

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Chemistry

What is the lifetime of OH at the sea level, assuming that thefollowing reactions are the principal sinks for OH in thetroposphere. Answer in sec to two significant digits.

OH + CO → CO2 + H (1)

OH + CH4 → CH3 + H2O (2)

The density of air at the sea level is 2.69 ×1019molecules cm-3, the mixing ratios of CO andCH4 are 80 ppbv and 1700 ppbv, respectively, and thereaction rate is kCO= 1.5×10-13molecules-1 cm3 s-1 for (1) andkCH4= 2.5×10-15 molecules-1cm3 s-1 for (2).

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