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- What is difference between SPE and DSPE?Calculate the NCV of a coal sample having the followingcomposition: C=80%, H=5%, O=4%, S=3.5% and ash=5%.Three large proteins are ionized at the pH at which an electrical FFF separation is carried out. (i) if the ions are designated A2+, B2+, and C3+, predict the order of elution. (ii) What is FFF? (iii) List the four subtechniques of FFF.
- Barium sulfate from a 1.300-g sample was contaminated with 9.4 mg of Fe2(SO4)3 and weighed a total of 314.0 mg. Calculate a) the apparent percent BaSO4 (Apparent – the value of analyte concentration obtained when the interference is not considered) b) the true percent BaSO4Ferric oxide (Fe2O3, density 5 5.24 g/mL) obtained from ignition of a gravimetric precipitate weighed 0.296 1 g in the atmosphere. What is the true mass in vacuum?Assume that a solute has a D* of 2.03 x 10-9 m2 / Sec and that w is equal to 0.5. If landfill leachate with a chloride concentration is next to a clay liner that is 2 m thick and the concentration of chloride is 2315 mg/L, what would be the chloride concentration at the outside of the liner after 25 years of diffusion. ? ignore any effects of advection. Defining a "release" from the landfill as a concentration exceeding 1 mg/l, how long will it take for a release to occur by diffusion alone? Provide answer in years to the nearest tenth. Eg: 10.3
- 100 mL of an A520 = 40 solution of potassium ferricyanide in water (FW 329.26) extinction coefficient of potassium ferricyanide at 520 nm is 2080 M-1 cm-1. Calculate the molar concentration of potassium ferricyanide that should exhibit A520 of 40 and amount of potassium ferricyanide needed to make 100 mL of this solution?1. Electron microprobe analysis of olivine from a mid oceanic ridge basalt (MORB) yielded the following abundances of FeO = 8.76 wt.% and MgO = 49.95 wt.%. Express the olivine composition as: A) mol % Fo (forsterite) and mol % Fa (fayalite) componentA batch of raw milk was tested and found to contain a bacterial population of 8xl06cfu/ml. It is to be pasteurised at noc for 33 seconds. The average D value at 52°C for the mixed population is 11 min. The z value is 10°C.i)Explain the terms "D value" and "z value".ii)Calculate how many organisms will be left after pasteurisation.iii)Hpw much time will be needed at 62°C to accomplish the same degree oflethality?iv. How much time will be needed at 82°C to achieve the same degree oflethality?
- A titrimetric method for the determination of calcium in limestone was tested by analysis of an NIST limestone containing 30.15% CaO. The mean result of four analyses was 30.26% CaO, with a standard deviation of 0.085%. By pooling data from several analyses, it was established that s = 0.094% CaO.a. Do the data indicate the presence of a systematic error at the 95% confidence level?b. Do the data indicate the presence of systematic error at the 95% confidence level if no pooled value for s was available?1. Suppose that the formation of mullite from a mixture of alumina and silica powders is a diffusion-controlled process. How would you prove it? If the activation energy is 50 kcal/mole and the reaction proceeds to 10% of completion at 1400°C in 1 hour, how far will it go in 1 hr at 1500°C? and in 4 hr at 1500°C? Answer: 0.15, 0.284.4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution of 10ml stock solution to 100ml volumetric flask X=0.98 (intensity)