Concentration (mg/l) Peak Area 0 158 10 10241 20 18425 30 26457 40 37125 50 44256 60 56124 Question: Determine the regression equation (a and b coefficients) from first principles
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| Concentration (mg/l) | Peak Area |
| 0 | 158 |
| 10 | 10241 |
| 20 | 18425 |
| 30 | 26457 |
| 40 | 37125 |
| 50 | 44256 |
| 60 | 56124 |
Question: Determine the regression equation (a and b coefficients) from first principles
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- Which of the following statements is a feature of scaled particle theory? a) The work required to insert a solute into a solvent depends on the solute's volume only b) The work required to insert a solute into a solvent depends on the solute's accessible surface area only c) High molecular-weight compounds cross biological membranes more easily than low- molecular weight ones d) A large particle has the same surface area-to-volume ratio as a small particle e) Particles in solution pay an energetic penalty to create a cavity in the solvent(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…if a volumetric pipet delivers 24.844g of deionized water at 31.00 degrees C, what is the calibrated volume of the pipet?
- 3.58 4.42 5.48 0.100 0.200 0.300 You wish to determine the value of the constant, 6, and to do so you will construct a linear plot. What will you plot ag what? y-axis label: x-axis label: From the values of x and y in the table above, calculate the values of the three corresponding data points. Click on the graph below, and use th "Freeform Curves" tool to plot the data. Line segments will automatically connect the points. Enter Solution What is the numerical value of the constant, b? Previous b =What is the precision? SHOW ALL CALCULATIONS:°F rtly cloudy m/alekscgi/x/Isl.exe/1o_u-lgNslkr7j8P3jH-lvWyv8WYLP6W0cqJcWJdIACROQwyw24GWHInMM72ts 1 NTBcSzwZOGGhrmIP4yCejeRhX9HIzqlzRTj2iaDBXTCRIHYWNO_-o?10... O CHEMICAL REACTIONS Calculating molarity using solute moles A chemist prepares a solution of mercury(II) iodide (HgI₂) by measuring out 0.0161 μmol of mercury(II) iodide into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's mercury(II) iodide solution. Round your answer to 3 significant digits. µ mol L Explanation Check x10 X Ś Q Search 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use **************** D 1/5 www Jessi Privacy Center | Accessibility
- What weight of mercury bichloride should be taken as sample, assuming 100% purity, so that 0.5 g og HgS will be obtained in a gravimetric analysis? Gravimetric factor = 1.1669Why is it better to use 10.0mL or greater of a liquid in measuring its density?P total=P1+P2+P3 P container A =3x287kPa =861 kPa P container B= 1/3*429kPa = 143 kPa P total=861 kPa+143 kPa = 1004 kPa Apply the significant figure rule to the final answer.
- Two students perform the analysis of an alloy containing aluminum and zinc by the same method that we used in Experiment 2. They obtained the following data 0.007 g Mass of empty gelatin capsule Mass of gelatin capsule plus alloy sample 0.336 g 141.209 g Mass of empty beaker Mass of beaker plus displaced water 307.712 g 20 °C Temperature of water (and reaction mixture) Barometric pressure Density of water at 20°C 29.32 in. Hg 0.09982 g/mL 17.5 mm Hg Vapor pressure of water at 20°C What is n ? H₂ -2 a. 3.103 x 10 b. 6.336 x 10 c. 4.442 x 10 d. 3.030 x 10 e. 1.089 x 10 -1 -21) Determine the mass of the condensed portion of the unknown that you placed in the test tube. 2) Use the mass of the water in the test tube and it’s density to calculate the volume of the test tube. 3) Use the calculations from Questions 1 & 2, along with the temperature of the boiling water bath and the barometric pressure of the room, to calculate the molar mass of the unknown compound. 4) identify the unknown liquid substance that you tested. 5) Using the SAMPLE data, calculate the molecular weight of the unknown and determine the identity from the chart.A 20ml mixture contains 10% volume methanol and 90% volume water. Find the mole fraction of water and methanol
