Question 51. Estimate the diffusion coefficient of carbon monoxide through air in which the mole fractions of each constituents are
O₂ = 0.18
N₂ = 0.72
CO = 0.10
The gas mixture is at 300 K and 2 atmosphere total pressure. The diffusivity values are
D CO = 18.5 * 10⁻⁶ m²/s at 273 K, 1 atm
D CN = 19.2 * 10⁻⁶ m²/s at 288 K, 1 atm
The C is carbon monoxide, O is oxygen and N is nitrogen.

Question 52. What is the molecular weight of Sulphur-dioxide?

Question 53. For what kind of mixtures Dᴀв=Dвᴀ holds?

Question 54. In the expression for molar flux Nᴀ=(Nᴀ+Nв)Cᴀ/C – DᴀвdCᴀ/dz, the terms representing bulk flow and molecular diffusion are, respectively

Question 55. The dimension of diffusion coefficient is given by

Question 56. What is the density of granite in kg/m³?

Question 57. Which one is having highest density?

Question 58. Air at 30 degree Celsius temperature flows at 45 m/s past a wet flat plate of length 0.5 m. Estimate the value of mass transfer coefficient. Assume that the water vapor content of air initially is negligible and take the following thermos-physical properties of air.
D = 0.256 * 10⁻⁴ m²/s
µ = 1.86 * 10⁻⁵ kg/m s
cₚ = 1.005 k J/kg degree Celsius
pᵣ = 0.701
p =1.165 kg/m³

Question 59. What is the density of oak in kg/m³?

Question 60. Assume the following thermos-physical properties of air
D = 0.256 * 10⁻⁴ m²/s
µ = 1.86 * 10⁻⁵ kg/m s
cₚ = 1.005 k J/kg degree Celsius
pᵣ = 0.701
p =1.165 kg/m³
Find the value of Schmidt number.