Benzene is stored in an open rectangular tank with the dimensions of 5 m length, 7 m width and 10 m height. A 15 mm stagnant air film is covering the benzene surface beyond which benzene is absent. At the atmospheric temperature of 25 C, its corresponding vapour pressure is 150 mm Hg, calculate the rate loss of the benzene in kmol/s. Given the diffusivity of benzene is 0.02 m2 /h and total pressure is 1.0 atm.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o