In a hot combustion chamber, oxygen diffuses through a stagnant film of air with thickness l to the carbon surface where it reacts to make co and co2. the reaction may be assumed to be instantaneous. no reaction occurs in the gas film. the chamber is at 1 atm, 1000 k, and l = 10 cm. the diffusivity of oxygen at these conditions is 0.42 cm/sec. gas constant is 82.057 cm -atm/mol. k. the reaction (4c + 302 → 2c0+ 2co2) occurs at the carbon surface: 1) let a - o2 and b-co, the relationship between nazand nb, z is (3 points) d) na, z=-(2/3)nb, z a) na, z = (2/3)nb2 b) na, z = (3/2)nb, z c) na2=- (3/2)nb, z ii) determine the molar flux of oxygen in mol/s-cm?