77 4.2 The chemistry of photochemical smog 1.0 0.8 Oxidants : NO 0.4 12 Time of

Question

77 4.2 The chemistry of photochemical smog 1.0 0.8 Oxidants : NO 0.4 12 Time of day 16 20 24 HC NO & NO2 03 O% ppmv ppb 5 025 50 0.20 40 HC NO 3 0.15 30 2 0.10 20 1 0.05 10 0.00 0- 12 16 20 24 Time of day Fig 4.2 (a) Sequence of chemical species appearing during a phorochemical smog event. Idealized plot based on results from laboratory studies in a smog chamber. (b) Sequence of chemical species during a photochemical smog event. Actual data obtained from measurements on the corner of Bay and Grosvenor Streets in Toronto, Canada on May 21, 1992. This was a cloudless, still day with maximum temperature of 26°C Data obtained from the Ministry of Environment and Energy, Government of Ontario.

Explanation / Answer

The average HC concentration is around 24 ppbv.

Now weight of HC molecule is = 1 + 12 = 13 (Since, atomic mass of hydrogen is 1 and atomic mass of carbon is 12)

Weight of Hydrogen in HC = 1/13 = 0.07692 x 24 = 1.8461 ppbv

Concentration of hydrogen is =  0.07692

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