Question

Carbon monoxide (CO) and hydrocarbons (HC) are the two main exhaust gases produced by the combustion of gasoline-powered vehicles. Their concentrations are regulated by required car inspections in some states. (a) Convert the regulatory standard of 220 ppm HC into mg/m3 (assuming a nominal molecular weight MW¼16). (b) If the actual exhaust concentration of CO (MW¼28) at a low speed emission test is 0.16%, what is the CO concentration in ppm and mg/m3?