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A 1.90 g sample of a large boimolecule was dissolved in 11.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is 5.03°C·kg/mol, and the boiling point of pure carbon tetrachloride is 76.50°C.
if adding 62.0 calories to an aluminum block causes the temperature of the aluminum to increase from 62*F to 89*F, what is the mass in grams of the aluminum block
Calculate the standard potential for this cell at 25 °C. Standard reduction potentials can be found here.
a solution of 4.00 g of sodium carbonate is mixed with one containing 4.00 g of silver nitrate. after the reaction is complete, the solutions are a mixture of salts.
suppose you chose phenolphthalein , which changes color at the end point from colorness(acidic) to pink at pH8.5 .Would you need the same , more or less volume of NaOH in the back-titration?
An unknown metal chloride has the formula MClx. The addition of 28.9 mL of 0.432 M aqueous lead (II) nitrate to 26.7 mL of 0.311 M aqueous MClx causes all the lead ions and chloride ions present in solution to precipitate out as lead (II) chloride
How much alcohol must be burned to generate enough heat to warm 279kJ from 60 degrees fahrenheit to 180 degrees fahrenheit
In a gas mixture, the partial pressure are argon 415 mmHg, neon 75mmHg, and nitrogen 125 mmHg. What is the total pressure (atm) exerted by the gas mixture
If a reaction mixture initially contains 0.159 M SO2Cl2 , what is the equilibrium concentration of Cl2 at 227 C?
calculate the molarconcentration of oxygen in water at 25 celsius for a partialpressure of 0.23 atm. the henry's law constant for oxygen
Calculating the Equivalent Weight of an Unknown Substance, An unknown organic carboxylic acid, mp = 139-141 degrees Celsius, is burned with a yellow, sooty flame. The sodium fusion test showed that nitrogen was present.
When a 8.37-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 445.8 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture
If 0.345 moles are produced during a reaction and collected at a temperature of 294K and pressire of .981 atm what volume will the gas occupy?
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