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You determine that the freezing point of a solution consisting of 20.0 g of cyclohexane and an unknown amount of naphthalene has a freezing point depression of 3.30 degrees C. How much naphthalene was added to the cyclohexane? Give your answer in grams to three significant figures.  Kfp = -20.4 deg/molal for cyclohexane.
a chemistry student needs of 40 ml chloroform for an experiment. by consulting the crc handbook of chemistry and
How much heat is released when 105 g of stem at 100.0*c is cooled to ice at -15.0*c. The enthalpy of vaporization of water is 40.67 kj/mol, the enthalpy of fusion for water is 6.01 kj/mol, the molar heat capacity of liquid water is 75.4 kj/(mol x ..
write the formula of the conjugate base for each of the following acids: a)HCO3^- b)CH3-NH3^+ c)HPO4^2- d)HNO2 e)HBrO
Consider a waterbody at that temperature containing 7.0 mg l-1 oxygen. By photosynthesis, 1.5 mg of carbon (as carbon dioxide) is converted to biomass (CH3O) during a single hot day.
An incompressible fluid (p(ro)= const) is contained in an insulated cylinder fitted with a frictionless piston. Can energy as work be transferred to the fluid?
125 mole of oxygen gas is added to carbon in a .25L container. The mixture equilibriates at 500K. Calculate the equilibrium concentration of carbon monoxide, knowing that K=.086 at 500K.
What do these results tell us about the difference in molecular mass between the aroma molecules and the colour molecules? In the lab there were both an 80C and a 100C distillate
a mixture of 75mole propane and 25mole hydrogen is burned with 25 excess air. fractional conversions of 90 of the
draw the substrate concentration versus reaction velocity plot of phosphofructokinase given that all of the modulators
How may (a) neutral (b) acidic and (c) alkaline aqueous solutions be defined in terms of concentrations of hidrogen and hydroxyl ions and the pH
Calculate the change in internal energy for a system if a gas cools and releases 10.86 kJ of heat and expanded from 2.35 L to 22.86 L at 3.50 atm
calculate the work done when 65.0 g of tin dissolves in excess acid at 1.00 bar and 23degc. assume ideal gas
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