Consider the following data for air trapped in a flask: pressure = 0.988 atm room temperature = 23.5°c volume of the flask = 1.042 l for this calculation, assume air is 78.5% nitrogen and 21.5% oxygen (by number of moles). r = 0.0821 l•atm•mol-1•k-1 n = 14.01 g/mol o = 16.00 g/mol what is the mass of air in the flask
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Chemistry, 21.06.2019 20:30, ksalinas7404
Un cierto gas tiene un volumen de 800ml a 80°c y 600ml a 80°c y 600mmhg de presión. ¿cual será el volumen del gas a condiciones normales? sí el gas es oxígeno, ¿cuál será su peso? y ¿cuántas moléculas están presentes en el sistema?
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Chemistry, 22.06.2019 05:30, MansellS5529
A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.
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Chemistry, 22.06.2019 06:30, themajesty9898
The minerals found in bones are deposited by living cells called
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Chemistry, 23.06.2019 02:00, jacckiie5176
Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane
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Consider the following data for air trapped in a flask: pressure = 0.988 atm room temperature = 23....
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