Related Questions

Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure. For ammonia, Molecular weight = 17 Molecular volume = 25.81 cm3/gm mole For air, Molecular weight = 29
In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system. For equimolar counter current diffusion:
Consider the following statements regarding the importance of diffusion and choose the correct answer:
1. The exchange of gases takes place by the principle of dependent diffusion
2. The process of diffusion is involved in transpiration of water vapours
3. The ions are absorbed by the simple diffusion during passive salt uptake
4. Diffusion is an effective means of transport of substances over a very short distance and helps in the translocation of food materials
A company owns some land and buildings for which the following details are relevant : Cost of land Taka 50,000; cost of building Taka 100,000, estimated life of building 20 years, estimated residual value of building Taka 2000; estimated residual value of land Taka 50,000. The company uses the straight line depreciation method. Which is the correct annual depreciation charge for this asset?
Other than getting the discount of 12% on the estimated cost of furniture and actual miscellaneous expenditure being Rs. 10200 instead of the estimated one, the family's estimated cost is correct. What is the total amount spent by the family in renovating its house?
Determine the pan evaporation from the following data using the Christiansen method. Extra-terrestrial radiation in cm = 47.3cm Coefficient of temperature(Ct) = 1.403 Coefficient for wind velocity (Cw)= 1.2 Coefficient for relative humidity (Ch) = 1 Coefficient for percent of possible sunshine(Cs) = 1.073 Coefficient of elevation(Ce) = 1.014
Which of the following statements are true?
1. The coefficient of rank correlation has the same limits as the Karl Pearson's coefficient of correlation.
2. The coefficient of correlation is independent of the change of origin but not of scale.
3. The covariance between $$X$$ and $$Y$$ is defined as $$\frac{{\sum {xy} }}{n}$$ where, $$x = \left( {X - \overline X } \right),y = \left( {Y - \overline Y } \right)$$      and $$n = $$ no. of paired observations.
4. $${b_{xy}}$$ is called regression coefficient of $$X$$ variable on $$Y$$ variable.
5. If $${b_{xy}}$$ is 0.4 and $${b_{yx}}$$ is 1.6, coefficient of determination would be 0.8.
Select the correct answer:
If the mole fraction of A and B are given as 1/3 and 2/3 respectively and their respective diffusion coefficient are 6 and 3. Calculate the inter-diffusion coefficient (in m2/s)
The measured tracer diffusion coefficient is exactly the same as the self-diffusion coefficient.
An estimated coefficient, which indicates degree by which estimated values are affected by random factors is known as