Computing the molar mass of the biomolecule
A .350 g sample of a biomolecule was dissolved in 15.0 g of chloroform, and the freezing point depression was determined to be .240 degree celcius. Calculate the molar mass of the biomolecule?
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Calculate the molarity and mole fraction of acetone in a 1.06 m solution of acetone (CH3COCH3) in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the volumes of acetone and ethanol add.
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Under water where the temperature is 17C and the pressure is 394 kPa, a diver inhales 2.1 L of air from his SCUBA tank.
A liquid unknown was found to be soluble in cyclohexane and alcohol; the unknown was found to have a boiling point of 58 C at 670 mm Hg. What is the substance? What could you do to confirm your answer?
A 48.4 mL sample of gas in a cylinder is warmed from 19 degrees Celsius to to 88 degrees Celsius. what is its volume at the final temperature?
Suppose 321 grams of methylamine (CH3NH2) and 332L of oxygen gas are mixed together in the reaction below at STP. how many grams of water should be prouduced?
An auto technician spills 85 mL of 2.6 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 2.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid, making sodium sulfate, carbon dioxide and water?
calculate avaerage rate of decomposition of H2O2 between 0 & 4.32 x 10^4 s.
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