The impact of volatile organic compound (VOC) emissions on ozone formation is a
ID: 1059212 • Letter: T
Question
The impact of volatile organic compound (VOC) emissions on ozone formation is a function of the type of VOC emitted (i.e., how reactive it is) and the VOC to NOx ratio present in the atmosphere into which the VOCs are being emitted. One way to quantify this phenomenon is to experimentally measure the incremental reactivity (IR) of a VOC. To measure IR, the VOC to be tested is injected into an atmosphere containing NOx and a mixture of VOCs typical of that found in the atmosphere in urban and rural areas. The amount of ozone formed per unit amount of VOC added to the atmospheric mix is then measured and the ratio is calculated to be the incremental reactivity (IR) The IR values for two different VOCs are provided below for a range of VOC: NOx ratios in the atmosphere. Which of the two compounds (ethane or propene) is more reactive with respect to ozone formation? Explain why for a given VOC (either ethene or propene), the incremental reactivity declines as the VOC:NOx ratio in the atmosphere increases from 8 to 40.Explanation / Answer
From this passage, it is clear that IR = amount of Ozone formed / Amount of VOC added
Propene is more reactive because the amount of ozone formed per amount of VOC added is more
for propene. If a reactant is reactive it obviously will form more product.
Amount of VOC added to the atmosphere is reduced for every adding, which means less product
i.e) will form. To be more precise ratio is directly proportional to amount of VOC added in to
atmosphere. So, if you decrease the concentration of VOC , the ratio will decline.
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