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A solution is prepared by dissolving 6.00g of unknown nonelectrolyte in enough water to make 1.00L of solution. The osmotic pressure of this solution is 0.750 atm at 25.0 C. what is the molecular weight of the unknown solute ( R= 0.0821 L.atm/K.mol)?
a cylindrical glass tube 13.0 cm in length is filled with mercury. The mass of mercury needed to fill the tube is found to be 107.5g. Calculate the inner diameter of the tube in centimeters.
What is the pH of a solution of 0.050M formic acid(HCO2H, Ka=1.8*10^-4) and 0.035M sodium formate
using the balanced reaction enter the formula chargeif any and state of the species exclude h2o in solution if neither
What is the [H3O+] of a buffer that consists of 0.154 M CH3CH2COONa and 0.645 M CH3CH2COOH. Ka of propanoic acid, CH3CH2COOH is 1.3 x 10-5.
The original sample is not pure, but is contaminated with a thermally stable compound. Will the reported mole ratio of CaO to CO2 be too high, too low, or unaffected? Explain
A0.4324 g sample of a potassium hydroxide-lithium hydroxide mixture requires 28.28 ml of 0.3520 M HCl for its titration to the equivalence point. What is the mass percent lithium hydroxide in this mixture?
for the experiment with eudiometer, you did not correct for the barometric pressure for the vapor pressure of water.
a compound has the empirical formula ch2o. when 0.0866 g is dissolved in 1.000 g of ether the solutions boiling point
The rate constant of a reaction increases by a factor of 2 when the temperature is increased by 10C above room temperature (25C). Calculate the activation energy for this reaction.
The buffer has a concentration of 150 mMol ( 150 mM of KH2PO4 / 150 mM K2HPO4. The pKa of the drug ephedrine is 9.6. Will the drug have a negative, positive, or neutral?
the element boron has two naturally occurring isotopes with masses of 10.0129 amu and 11.0093 amu. what is the percent
The following processes is a likely change in a redox reaction. Label the chemical change as an oxidation process, a reduction process, or neither
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