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In a protein determination, the color of dye changes to blue when it binds to protein, and the absorbance of light is measured. The data below were taken to calibrate the instrument. An unknown protein sample gave an absorbance of 0.867 ( corresponding to the average of three replicate analyses of the unknown sample). Calculate the mass (micrograms) of protein in the unknown. Calculate the absolute uncertainty for the answer.
Data:Protein (micrograms): 0.00, 9.37, 18.73, 28.08, 37.44Absorbance: 0.490, 0.720, 0.850, 1.110, 1.250
Propose a method to accurately measure the melting point of vegetable oil both before and after hydrogenation. Keep in mind that it will be too thick and greasy to insert in a capillary tube
The temperature of a 150 gram drinking hlass decreased from 25 to 14 * C as 200 grams of water were added
When 0.228 g of the hydrate ZnSO4•xH2O is heated, 0.128 grams of anhydrous ZnSO4 remains. What is the value of x in the formula for the hydrate?
draw Lewis Structures for the following FIVE elements.
Use the concentrations given below for the concentrated chemcal molarities and write out your calculations to obtain the volume of each stock solution needed to obtain 30.00 L of a 6.00 M
salicylic acid reacts with methanol to produce oil of wintergreen and water. If water is added to the solution, a precipitate is formed. identify the precipitate and explain why it is formed.
At 373 K, Keq = 2.39 for the following reaction: SO2Cl2(g) = SO2(g) + Cl2(g) In an equilibrium mixture of the three gases, the partial pressures of SO2Cl2 and SO2 are 3.31 atm and 1.59 atm, respectively.
A 50.0 gram piece of iron at 152 degrees celsius is dropped into a 20.0 grams of Water at 89 degrees Celsius in an open thermally insulated container. How much water would you expect to vaporize, assuming no water splashes out?
Describe an electrochemical cell that would have the following net equation, by answering the following questions. Fe(s)+Ni^2(aq)-->Ni(s)+Fe^2+(aq)
when using a rotary evaporator, the water bath is typically kept at a temperature below the normal boiling point of the solvent to be evaporated
The sulfuric acid in a car battery has a density of 1.225 g/cm3 and is 3.75 M. What is the molality, mole fraction, and percentage of sulfuric acid by mass in this solution?
What is the partial pressure of each gas and total pressure of the mixture of gaases, in atmospheres, in the container?
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