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How many litres of ethyl mercaptan (C2H5SH ; liquid
density = 0.8931 g/cm^3) should be added to 100,000
standard cubic meters of natural gas to produce a
concentration in the gas of 1ppm?
other info
molar mass (C2H4SH) = 62 g/mol , (CH4 - natural gas) =
16 g/mol
1 standard m^3 = 1000L
1 mol = 22.4 L at STP (p = 1 atm, T = 273 K)
Solution
wt of natural gas in 100000 cubic meters is
(16/22.4)*100000000 1cubic meter=1000 litres
=71428571.43g for ppm of 1 amount of c2h5sh to be added
is 71.43grams (71428571.43/10^6)1 million=10^6 volume
of c2h5sh=71.43/0.8931=79.98litres

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