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How much energy is required for an electron in a Hydrogen atom to make a transition from the n=2 state to the n=3 state? What is the wavelength of a photon having this energy?
What is the number of grams of NaH2PO4 which are needed to react with 43.74 mL of 0.285 M NaOH. NaH2PO4 (S)+ 2NaOH(aq) ----> Na3PO4 (aq)+ 2H2O (l)
Polyvinyl chloride (PVC) is made by addition polymerization of vinyl chloride (VCM C2H3Cl). Vynyl chloride is synthesized from ethylene(C2H4 in a two step process involving
what is the solubility of CaF2 in a solution that has a equilibrium concentration of .01M EDTA. Ksp (CaF2)= 3.9 x 10^-11, Kf(CaEDTA)=5x10^10
Nitrogen oxide is a pollutant in the lower atmosphere that irritates the eyes and lungs and leads to the formation of acid rain. Nitrogen oxide forms naturally in atmosphere according to the endothermic reaction: N2+O2=2NO(g) Kp= 4.1x10^-31 at 298..
What is the activity coefficient of H in a solution containing 0.020 M HCl and 0.010 M Ca(ClO4)2? What is the pH of this solution
calculate the number of joules required to melt 43.6g of benzene at 5.5 degrees celsius?nbspthe heat of fusion for
Briefly explain in terms of structure, basicity, and solubility why Novocain® is usually administered by injection whereas benzocaine is typically used in salves.
A gas sample occupying a volume of 64.7mL at a pressure of 0.971 atm is allowed to expand at constant temperature until its pressure reaches 0.389atm. what is the final volume
The bomb that destroyed the Murrah Federal Office building in Oklahoma City in April 1995 was constructed from ordinary materials: fertilizer(ammonium nitrate) and fuel oil
Calculate the pH at the equivalence point in titrating 0.110 M solutions of each of the following with 7.0×10-2 M NaOH.
in a controlled greenhouse at 30.0ordmc and 1.0 atm a crop of seedling tomato plants was found to consume 380 l of
Total heat evolved by the reaction by adding the heats required to raise both the solution and the calorimeter to the maximum temperature. 5). Heat evolved per mole of Mg 6) Change in enthalpy for the following specific reaction. Be sure to indica..
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