Answer / ammarahmed

Mole volume of gas at standard temp and pressure 25°C 1 atm is 24.44 L or 0.02444 m3/mole

460000/0.02444
= 18821603 mole/day

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4 Answers   BCPL, HPCL, NOCL, Reliance,

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Suppose you have hot oil and cold water, what kind fluid you flow In shell side and tube side and why?

5 Answers  

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hai please please if any one have useful test related and interview based question plz send me at saify_0@hotmail.com i will be thankfull

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Specific Heat of Bagasse at 50% moisture, 40% moisture and 25% moisture?

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Hi this is aparna.............can any one send drdo question papers on my email id-aparna_patna08@yahoo.com Thanks in advance

2 Answers   DRDO,

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Dielectric materials in static fields

0 Answers   HCL,

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Define octane number?

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1 Answers  

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Question 90 - In the calculation of the growth of bacteria, absorbance, A in spectrophotometry is used. According to Beer-Lambert Law, A = e x l x c where A is the absorbance of the solution (no unit), l is the distance of light travels through the solution (in cm), e is the molar absorptivity or the molar extinction coefficient [ in L / (mol.cm) ]. For a particular solute and fixed path length : As / Ao = Cs / Co where Ao is the observed signal for a known concentration Co, and As is the observed signal for a sample concentration Cs. (a) For a cell concentration of 560 cells / mL, a spectrophotometre gives an absorbance reading of 1.0. A mixture of concentration 3600000 cells / mL can be diluted in several operations, with each operation having a dilution of 1:20. How many dilutions should be made so that the concentration of this mixture can be calculated within a range of A = 0.0 to 1.0. (b) In another experiment, a sample tube of 1 cm in width is used. Let A = 0.06 and e = 0.0012 ml / (cell.cm). Find the cell concentration of the sample.

1 Answers  

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