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Some physical properties of water are shown below. freezing point 0.00°C boiling point 100.00°C Kf 1.86°C/m Kb 0.512°C/m What is the freezing point of a solution of calcium chloride that contains 26.0 g CaCl2 dissolved in 330. g of water, answer should be significant to 0.01's place? Use molar masses with at least as many significant figures as the data given. °C What is the boiling point of the solution, answer should be significant to 0.01's place? °C
Use the Henderson-Hasselbalch equation to calculate the pH of each solution: a solution that is 0.140 in propanoic acid and 0.125 in potassium propanoate.
describe the molecular geometry of formic acid in terms of hybrid orbitals,bond angles and sigma and pi bond, and how many lone pairs are in the molecule.
An excited electron in a hydrogen atom relaxes to the n=4 level emitting light with a frequency of 1.141*10^14 Hz. In what principal quantum level did the electron begin?
explain why it is dangerous to mix solutions in a test tube by placing a finger
How many grams of magnesium may be formed by the passage of 76.0 amps for 8.03 hours through an electrolytic cell that contains a molten magnesium salt.
A 36.4 L volume of methane gas is heated from 25 degrees celcius to 88 degrees celcius at constant pressure. What is the final volume of the gas?
32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 49.1 g of 32P, how much 32P was present 7.00 days ago
A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.30 nm. It then gives off a photon having a wavelength of 1820 nm
Consider the following system in equillibrium CaCO3(s) = CaO(s) + CO2(g) How many phases are present. Explain.
If you dissolve 4 aspirin tablets in a 340mL glass of water, what is the pH of the solution and the percent dissociation?
Use standard enthalpies of formation to determine ?Horxn for: 3NO2(g) + H2O(l) ? 2HNO3(aq) + NO(g) Enter in kJ. Find the change in internal energy for this reaction. Enter in kJ.
consider the reaction CO2+H2=CO+H2O.The equilibrium concentrations are [CO]= 0.050M, [H2]=0.045M, [CO2]=0.086M, and [H2O]= 0.040M. Calculate K .
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