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Compute the concentration of [HPO4]2- and [H2PO4]- at pH 5.60 in a solution containing one mol of phosphate per liter (pKas for phosphate: 2.14, 6.86, 12.4)
Referring to the standard enthalpies of formation, why would silver not dissolve in hydrochloric acid?
The alpha-particles ionize molecules in the air, allowing it to conduct an electric current. When smoke particles enter, the conductivity of the air changes and the alarm buzzes. (a) Write the equation for the decay of (mass number 241, protons 95..
You have two solutions of the same molar concentrations; one contains lactic acid, the other sodium lactate. You want to use these solutions to make a buffer that has a pH of 5.00. Calculate the ratio of lactate and lactic acid required. The pKa o..
the smallest atoms can themselves exhibit quantum mechanical behavior. calculate the de broglie wavelength in pm of a
Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with n = 5 in a one-dimensional box 39.8 pm in length.
The diameter of a penny is 19mm. the diameter of a Cu atom is 2.6A. How many Cu atoms side by side in a straight line could fit across the diameter of a penny
Calcium nitrate will react with ammonium chloride at slightly elevated temperature: Ca(NO3)2 (s) + 2 NH4Cl (s) ---> 2 N2O (g) + CaCl2 (s) + 4 H2O (g) A 1.00 mol sample of each reactant will give what volume of dinitrogen monoxide at STP
The concentration of commercially available nitric acid is 70.0 percent by mass, or 15.9M. In 100 grams of solution, there are 1.11 mol HNO3. Calculate the volume of 100 g of the solution.
A 1.85 g sample of a compound containing merely carbon and hydrogen is combusted to give 5.43 g Co2 and 3.33 g H20. Explain what is the empirical formula of the compound
which atom will have the largest atomic radius? Sb, Ba, or F?
0.1 g of Na2CO3 - K2CO3 powder mixture was reacted with excess HCl. According to the gas volumetric measurement, 20.4 cm^3 of CO2 was evolved at 25 degrees Celcius and 730 Hgmm pressure. Calculate the composition of the original mixture
Green light of a wavelength 516 nm is absorbed by an atomic gas. What is the energy difference between the two quantum states involved in the transition.
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