Past exam of the chemistry course of the year 3 of the natural sciences course of the University of Cambridge / 2022 / Paper 3 / 43 / b / i

Table of contents
- Solution i

Solution

For the stated total number density, multiply the number atmospheric mixing ratio by

[M]

. With NO

_{x}

defined as NO plus NO

_{2}

,

[N O_{x}] [N O_{2}] [H_{2} O] = 2.46 \times 1 0^{11}, = 1.722 \times 1 0^{11}, = 7.38 \times 1 0^{17} [NO] [O_{3}] = 7.38 \times 1 0^{10}, = 9.84 \times 1 0^{11}, molecules c m^{- 3} .

The water partial pressure is

30/1000 = 0.030

of the total pressure. It is a 3% number fraction, not 30 ppm.

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