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When a 4.25g sample of solid ammonium nitrate dissolves in 60 g of water in a coffee cup calorimeter,the temperature drops from 22 oC to 16.9oC. Calculate the ΔH(in KJ/mol and also the ΔH in Kj/g NHΔ4NO3) for the solution process.Assume the specific heat of the solution is the same as of taht of pure wate which is ΔH=4.18j/g.K)?
Calculate the percent ionization of 8.0×10?2 M lactic acid (Ka = 1.4x10^-4) Calculate the percent ionization of 8.0×10?2 M lactic acid in a solution containing 4.5×10?3 M sodium lactate.
radio waves travel at the speed 3.00 108 msspeed of light. if saturn is 7.9 108 km from earth thendetermine how many
Solid lead (I) sulfide reacts with aqueous hydrochloric acid to form solid lead (II) chloride and dihydrogen sulfide gas.
You are told to prepare a Ammonium buffer solution (0.15M, pH 8.5; 1.0L). You have HCl (0.15M); Ammonia (NH3) and Ammonium chloride (NH4Cl); solid 100g) (Kb for NH3 = 1.8 x 10-5). Please show how you are going to prepare this solution.
It takes 245 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect?
Determine the concentrations of the following ionic species present in a 0.333 M solution of the diprotic acid H2SO3. For H2SO3, Ka1 = 1.4E-2, Ka2 = 6.3E-8.
How many moles of CH_3_COOH are present in the beaker? What is the concentration of acetic acid?
Calculate the molar mass of an unknown solid (assume a non nonelectrolyte) if 1.35 grams of the solid was dissolved in 15.0 grams of dodecanol and caused a freezing point depression of 2.34 degrees Celsius.
A sample contained a mixture of CdS and ZnS. The amount of CdS was determined by reacting 5.903 g of the sample with an excess of HCl to release H2S from each compound
Which of the following statements regarding the possible effects of radiation on a cell is incorrect. Radiation can pass through a cell with no damage.
In the molecular orbital model of the cyclopentadienyl cation, how many pairs of degenerate pi-antibonding molecular orbitals are there
When a container is filled with 3.00 mol of H2 , 2.00 mol of O2 , and 1.00 mol of N2 , the pressure in the container is 465 kPa. The partial pressure of O2 is ?
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