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19. Convert 15 ppm of benzene to mg/m3 at 20 oC and 720 torr

Density of a gas is g/L = P(MW)/RT

(740 torr x 1 atm/760torr)(78.114g/mole)/ (.0821L atm/mole K)(293K) = 3.16g/L

1ppm =1 L Benzene/106 L of air = 1L ben/1000 m of air = 0.001 L ben/m3 = 0.00316 g/m3
x/3.16=15 = 47.4mg/m3 ???

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