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The enthalpy of combustion of benzoic acid (C6H5COOH) which is often used as the standerd for calibratie calorimeter. calorimeters, is -3226.7 kJ/mol. When 2.5127 g of benzoic acid was burned in a calorimeter, the temperature increased from 20.84 to 25.67C. What is the heat capacity of the bumb.?
Standard solutions of calcium ion are suually prepared by weighing an apporpriate amount of primary standard grade calcium carbonate, dissolving it in concentrated HCl, and diluting to the appropriate volume.
Calculate the mass of aluminum deposited on the purified aluminum metal by the application of a current of 1.225 kiloamperes for 30 minutes from a very large quantity of a solution containing Al3+ ion in the Al2O3/Na3AlF6 molten state
Determine the electron geometry (eg) and molecular geometry (mg) of CH3+1.
The Label on a one pint bottle of water lists the following components. If the density is the same as pure water and you drink 3 bottles of water in one day, how many milligrams of each component will you obtain?
Consider the exothermic reaction A(g) + B(g) C(g) + D(g). Would you expect the addition of heat to lead to the formation or consumption of A(g)? Why?
At 9.°C and 1.40 atm pressure, a sample of helium gas occupies a volume of 5.10 L. The sample is compressed and heated to 60.°C. Calculate the final pressure of the sample, if the final volume is 3.64 L.
In a first order decomposition in which the rate constant is 0.201 sec-1, how long will it take (in seconds) until 0.131 mol/L of the compound is left, if there was 0.566 mol/L at the start
PbCO3(s)+2H^+(aq)+2H^+(aq) yields Pb^2++H20(l)+CO2(g), how many grams will dissolve when exactly 4.5 L of 2.00 M H+ is added to 3.00 g of PbCO3
A current of 3.15 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution.
At what temperature would the rms speed of H2molecule be same?
A sample of copper was pretreated and diluted to 500mL and portions of this solution were analyzed by measuring the absorbance of a copper (I) complex of 1, 20 phenanthroline using a standard addition technique.
The atom then emits two photons: one of wavelength 1282.2 nm to reach an intermediate level and a second to return to the ground state. What was the wavelength of the second photon emitted?
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