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Calculate the pH of a solution prepared by mixing 20mL of .20M NH3 with 40mL of .10M HNO3 (Kb for NH3= 1.8 x 10^-5)
An "empty" container is not really empty if it contains air. How may moles of nitrogen are in an "empty" two-liter cola bottle at atmospheric pressure and room temperature (25 C)? Assume ideal behav
Given the following heat capacities, (assume they are constant over the temperature range in consideration here), calcrulate enthalpy for the reaction 2NO + O2 ->2NO2 at 398k.
12.0 moles of gas are in a 3.00L tank at 22.7C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300L^2*a
Someone is forced to titrate a solution containing 100 mL of .250M sodium acetate with .125 M nitric acid. Calculate the pH of the solution after adding 50.0 mL of the nitric acid.
At 298, 1 atm, the heat produced by the reaction of 4.00mol of NO with molecular oxygen heats 1.07L liquid water from 298k to 348k. Calculate enthalpy for the reaction 2NO + O2 -> NO2, at 298k. A
A sample of Chlorine gas occupies a colume of 711 mL at pressure of 251 mmHg. Calculate the pressure of the gas (in mmHg) if the volume is reduced at constant temperature to 173 mL in scientific not
Draw and label the galvanic cell, then write and identify he two half-life reactions and write the overall cell reaction. Calculate E. Write the cell diagram for the galvanic cell and calculate the e
What volume will 5.6 moles of Sulfur hexafluoride (SF6) gas occupy if the temperature and pressure of the gas are 128 deg C, and 9.4 atm?
At 50 degrees C, the value of pKw (the dissociation constant for water) is 13.262. Calculate the pH of water at this temperature.
what crystal structure would you predict for a crystal containing fe2+ and f-? with radii 75 and 136 pm
Titration curve. Consider the titration curve of 10 mL of 0.1 M HA, Ka=1.0x 10^-4 with 0.1 M NaOH. Calculate the pH after 5, 10, and 15 mL of NaOH are added
What happened when CaCO3 was combined with hydrochloric acid? was a chemical reaction obvious here ? what about NaOH added to HCl?
If 2.93*10^4 liters of water are required to dissolve 1g of calcium phosphate, and the solubility of calcium phosphate is 3.41*10^-5 g/l. what is the solubility of calcium phosphate in parts per mil
The rate of reaction indicates the speed at which the reaction can occur. It can be expressed in terms of a change in the concentration of reactants or products per unit of time
If the solubility of calcium phosphate is 3.41*10^-5 g/l. How many liters of water are required to dissolve 1g of calcium phosphate
During a breath, the average human lung expands by about 0.50L. If this expansion occurs against an external pressure of 1.0 atm, how much work in J is done during the expansion?
A certain reaction with an activation energy of 185kj/mol was run at 455k and again at 475 . What is the ratio of f at the higher temperature of f at lower temperature? one significant figure
A gaseous hydrogen and carbon containing compound is decomposed and found to contain 85.63% C and % H by mass. The mass of 258 mL of the gas, measured at STP, was found to be 0.646 g. What is the mo
Typical lab experiment exploring le chateliers principle. HCl is added to Pb(NO3) until precipitate forms. Question asks: Explain why PbCl2 did not precipitate immediately on addition of HCl. What c
Draw the skeletal structure of the major organic product formed when benzaldehyde reacts with Cl2 in the presence of AlCl3. Assign atomic charges where appropriate.
what is the [H3O+] and the pH of a benzoic acid-benzoic buffer that consists of 0.15 M C6H5COOH and .47 M C6H5COONa? (Ka of benzoic acid = 6.3 * 10^-5)
What if any experimental evidence do you have that the equilibrium is affected by the addition of concentrated HCL? Explain Are your observation and explanation in A consistent with Le Chatelier's
Trifluoroiodomethane, CF3-I, undergoes free radical addition to alkenes. Explain the fact that the free-radical addition of this compound to 2-methyl-2-butene is faster than its addition to 1-penten
calculate the pH and concentration of all species present assuming that the activity coefficients are equal to 1.0 for all species