If the tropospheric concentrations of oh and cf3ch2f are 8.1×105 and 6.3×108 molecules/cm3, respectively, what is the rate of reaction at this temperature in m/s? express the rate in molarity per second to two significant figures.

2.3*10^-19 M/s

Explanation:

Generally, reaction rate is the product of the rate constant, and the concentrations of the reactants in the system. Therefore, the rate of the reaction can be expressed as:

rate = k*

The value of the rate constant k is 1.6*10^8 [1/(M*s)] at the given temperature.

= 6.3*10^8 molecules/cm^3

= 8.1*10^5 molecules/cm^3.

However, we need to convert to mol/(L(M). Therefore:

6.3*10^8 *(1000/6.023*10^23) = 1.05*10^-12

8.1*10^5 molecules/cm^3 *(1000/6.023*10^23) = 1.3*10^-15

Thus:

rate =k* = 1.6*10^8* 1.05*10^-12* 1.3*10^-15 =2.3*10^-19 M/s

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

b is the correct answer

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