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- (c) Explain how ab initio method is different from semiempirical method.In the following figure, which parameter of van Deemter equation is involved in these variations. Which curve of them would provide the best separation of analytes and at what linear velocity?9- It flows (10 cm') of olive oil during a capillary tube (2 cm in length and (0.04 mm in diameter) If the height of the olive oil in the capillary tube (2.5 cm), calculate the time of the olive oil flow into the capillary tube, if you know that the viscosity of the oil ( ŋ oil = 0.18 N .sec/m? ) density of oil gm (0.918 Cma)?
- vo/index.html?deploymentld=55750828934189288909969212&elSBN=9781305657571&snapshotld%3D2199898&id31... O Tp * NDTAP Q Search this Use the References to access important values if needed for this question. Trisilane (SiąHg) is a liquid with a density of 0.739 g cm³. It reacts with oxygen to give silicon dioxide (SiO2) and water. Calculate the mass of silicon dioxide that would form if 21.3 cm³ of trisilane reacted completely with excess oxygen. g silicon dioxide * Submit Answer 5 question attempts remainingWhy is it better to use 10.0mL or greater of a liquid in measuring its density?The diffusion coefficient of water molecules in hydrogen (the carrier gas) at 307 k and 1 atm is 1 cm2/sec. What is the average time that the water molecules to travel a distance of 1 mm in the gas chromatographic system? Assuming there no interactions between water and the system.
- To prepare 5 ml of an eyedrop solution to 10 cps by mixing glycine and water,,................ml of glycerin is needed.(pure glycerin viscosity 500 cps, water viscosity 1cps).(This question and the next 2 questions are breakdowns of the same question) A student John wanted to measure the molar mass of an unknown material (UM) via the boiling point change of a solvent. He chose a solvent, ethanol, that can dissolve the material and sugar. He wanted to use sugar (MW = 342.3 g/mol) as a reference sample to get an ebullioscopic constant for his system to reduce the effect of other measuring errors such as pressure, measuring errors, and impurity of the samples. He made 10 solutions each contain 100 g of ethanol and various amont of solute as list in the table. He fits the two sets of data and obtain the molar weight of the unknown materials. For this question answer the fitted boiling point of pure ethanol: ____ K. 4 sig. fig. Thre rest ? marks in the tale will be answered in the next two questions. Copy the data into Excel and use trendline to fit or calculate the average values for this and the next 2 questions. Sample # Sugar (g) B.P. (K) Sample # UM…Provide the remaining data missing
- 6. A volatilization gravimetry experiment was conducted on an unknown organic liquid (presumed to only contain carbon, hydrogen, and oxygen). The liquid was massed (data in the first column below) and then combusted in an excess of oxygen. The exhaust gas was passed through a trap containing drierite and then through a trap containing ascarite. The starting and ending masses of the drierite and ascarite were used to obtain the data in the second two columns below. Mass Unknown 12.4370 12.5590 12.2230 Mass CO2 17.0822 17.2497 16.7882 Mass H₂O 13.9849 14.1221 13.7443 A.) Calculate the mass percent of carbon, hydrogen, and oxygen in the unknown liquid. There are no outliers, so you can average the data before processing, if you wish. B.) Calculate the empirical formula of the unknown compound.Liquid Partitioning with Separatory Funnel A student carried out the following procedures in a laboratory work. 1) Water was shaken with ether in a separatory funnel, the two liquids separated into two phases. 2) The student shook water and methylene chloride (dichloromethane) in another separatory funnel, again the mixture separated into two phases. In the space provided below: a) Sketch the separatory funnels showing the two phases of the mixtures in procedures 1 and 2. ( b) Label each funnel with the experimental process (i.e. ether-water or methylene chloride-water). c) Label the two phases in each funnel with the identity of the liquid. d) Explain the reason for differences in phases of the two experiments. flask)Match the following terms with their corresponding definitions: Accuracy How close the measured va v Precision The deviation of the measu [ Choose ] How close the measured value is from the true value The deviation of the measured value from the average of all measured values How close the measured value is to the other measured values