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Use satndard enthalpies of formation to calculate standard enthalpies of reaction for the reactions: a) C(graphic) + 2H2O(l) ---> CO2(g) +2H2(g) b) 2CH4(g) + O2(g) ---> 2CO (g) + 4H2(g) c) 2CO(g) + 2Cl2(g) ---> 2COCl2(g) d) Na2SO4 (s) +4CO(g) ---> Na2S(s) +4CO2(g) e) 4HCl(g) + O2(g) ---> 2Cl2(g) + 2H2O(l)
Dissolving 4.69g of an impure sample of calcium carbonate in hydrochloric acid produced 1.07 L of carbon dioxide (measured at 20.0 degrees Celcius and 737mmHg). Calculate the percent by mass of calcium carbonate in the sample.
170 mL of an HCl solution with pH of 2.60 is added to 200 mL of an HNO3 solution. The resulting pH is 1.40. What was the pH of the original HNO3 solution?
The internuclear distances in gas-phase ionic molecules are considerably smaller than those in the corresponding crystals.For exemple,
If 36.0 mL of 0.150 M HCl(aq) is needed to neutralize all the NH3(g) from a 2.25-g sample of organic material, calculate the mass percentage of nitrogen in the sample.
A 2.50-g sample of a large biomolecule was dissolved in 37.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C.
Determine the molarity of a solution prepared by dissolving 4.50 mol of NH4Cl in sufficient water to make 2.00 L of solution.
The minimum energy needed to eject an electron from a sodium atom is 4.41 X 10^-19. What is the maximum wavelength of light, in nanometers, that will show a photoelectric effect with sodium?
Predict whether a precipitation reaction will occur when aqueous solutions of ammonium sulfate and calcium acetate are mixed. Write the net ionic equation.
What are the odds of finding a particle in a one dimensional box between 0 and L/2, where L is the length of the box. Assume that the particle is in the second to lowest energy level (n = 2).
If 30.00 mL of 0.500 M KOH are needed to neutralize 10.00 mL of HCl of unkown concentration, what is the molarity of the HCl
What would you observe in a sample which contains both silver and lead ions if the first precipitate (AgCl (s) and PbCl2 (s)) was not treated with hot water
How much of a 15.0M HNO3 solution should you use to make 850.0mL of a 0.300M HNO3 solution
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