What is an additive?

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PLEASE ANY ONE READ THIS MESSAGE ANSWER ME AT MY EMAIL ID surendrasaroj18@gmail.com sir i am prepairing for section engineer exam taken by railway my branch is chemical engineering i want previous paper of chemical engineering of section engineer exam taken by railway. please answer me as soon as possible thankyou

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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.

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i want pattern of ONGC Written examination

13 Answers   IOCL, ONGC, Reliance,

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How i can calculate heat transfer in reactor at unsteady state and what data should i have? I want equation and process to calculate it? As there is steam or brine in jacket

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hi, i have completed B.tech Chemical enggneering, plz can anyone provide me GVK BIO company's interview questions. iam attending the interview for the first time..

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In a Furnace arch pressure is more than Hearth pressure,then how flue gas travels to stack

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How is waste heat boilers categorized?

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What is a good method of steam tracing large vessels?

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What kind of concerns is associated with temperature pinch points in condensers?

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What is the symbol of sodium?

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How much will be the increment for postal assistant yearly?

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