Part c- Calculation Questions: Answer all questions in the answer book provided. (20 marks) 1. A drum contains 303.4 lb of toluene. If the lid of the drum is left open (lid diameter = 3 ft), a) determine the time required to evaporate all the toluene in the drum. (The temperature is 505 degree R) b) Estimate the concentration of toluene (in ppm) near the drum if the local ventilation rate is 1000 ft3/min. The pressure is 1 atm. (Hint: use Antoine equation for the saturation pressure calculations) 12 marks (Following data are given Ko = 0.83 cm/s-Mw of Toluene = 92.13 g/mol, 1inch = 2.54 cm Rg = 10.73 psia ft3/lb mol degree R Toluene Psat = 36.33 mmHg, and 760 mmHg = 1 atm) - Calculation steps must be shown in order to get full marks. List your given data and questions asked for, also show all the formulas that you are using and finally do not forget to enclose your answer within a box with proper unit)