Toluene $($MW $=92\mathrm{.}13,$ specific gravity $=0\mathrm{.}866,$ TLV $=50$ ppm$)$ is lost by evaporation from aprocess at a rate of $1\mathrm{.}3$ pints per hour. What general ventilation rate is required to maintain the vapor concentration at the TLV$?$ Assume a mixing factor of $4.1640$ cim $6570$ cfm $98,500$ c$/$m $394,000$ cim