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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, 37.44
Absorbance: 0.490, 0.720, 0.850, 1.110, 1.250
a 200-g sample of a metal absorbs 500 J, and its temperature rises by 30 degrees celsius. what is the specific heat of the metal?
At a given temperature, 1.40 atm of H2 and 2.03 atm of I2 are mixed and allowed to come to equilibrium. The equilibrium pressure of HI is found to be 1.305 atm. Calculate Kp for the reaction at this temperature.
Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 6.10 MJ of energy (in the form of heat)
Background: If aqueous NaOH is added to tert-butyl chloride acetone solution, initially the solution is basic due to the hydroxide ions from the NaOH.
Write an overall balanced equation and a net ionic equation for the complete neutralization of aqueous H2SO4 with aqueous NaOH. Be sure to include phase designations such as (s) and (aq).
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What is the concentration of toluene in air produced by vaporizing 1 ml of liquid toluene into clean air to produce a total volume of 100 liters
Calculate what quantity of potassium chlorate that has molecular weight of 122.5 needed to form 33.6 litres of oxygen? Express your answer in grams and assume that temperature and pressue will be in normal condition?
Draw the structures of the eight isomeric pentyl alcohols (C5H11OH) and name them including primary
Calculate the pH of a solution prepared by mixing 20.0 mL of 0.01 M HCl with 100.0 mL of 0.10 M HCN. For HCN, Ka = 1.0 x 10- 10. Assume that the volumes are additive.
A 280 mL stock solution contains 2.3 M Ca(CN)2. When 105 mL of the stock solution is diluted to 120 mL, how many moles of CN- ions will be contained in the dilute solution?
Calculate the pH for the soluton after addition of solid sodium formate to cause the formate ion (CHOO-) to increase to 0.2 M
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