A sample of air has been collected above an air strip-ping tower to evaluate its performance and to deter-mine if toxic air emission standards are being violated. The temperature at the time of...

A sample of air has been collected above an air strip-ping tower to evaluate its performance and to deter-mine if toxic air emission standards are being violated. The temperature at the time of collection was 18°C and the atmospheric pressure was 740mmHg. The concentrations in the sample were 4.8mg/m3 of benzene and 1.7mg/m3 per chloroethylene, and 2.0mg/m3 of methylene chloride. Calculate the concentrations in ppm using the equation as follows: Cppm =C(RT/PM)×106, where C is the concentration of the sample in mg/m3, R =8.21−10−5 (m₃·atm/mol·K), M is the molecular weight of the gas, and T is the absolute temperature in K.