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# Rate of rxn given concentrations and rate constant

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For the concentration of hydroxyl radical of 7.5E06 molecules/cm3 and a carbon monoxide concentration of 18 ppm, calculate the rate of its reaction with atmospheric carbon monoxide at 11 degrees C, given that the rate constant for the process is 5E-13 E-300/T molecule-1 cm3 sec-1.

Hint: Convert the rate constant to a numerical value. Calculate the CO concentration to molecules/cm3, calculate the rate.

https://brainmass.com/chemistry/stoichiometry/rate-of-rxn-given-concentrations-and-rate-constant-41808

#### Solution Preview

Hint: Convert the rate constant to a numerical value. Calculate the CO concentration to molecules/cm3, calculate the rate.

This is not an equilibrium constant so k*[CO][hydoxyl radical] does not give the rate.
Kr x molecules/cm^3 = rate in molecules/sec that react

18 ppm for the CO concentration as a gas is again 18 ppm(v) or 18 moles/1,000,000moles air

Recall that for any ideal gas, ppm (or ppb) by volume is the same as ppm (or ppb) by moles. Consequently, if we know, for example, that the concentration of CO2 in the atmosphere in the year 2002 is 373 ppm(v), this means that for every million moles of gas in the ...

#### Solution Summary

The answer is provided as a step-by-step equational process with explanation of the process throughout.

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