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An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 114 THz. What is the value of n for the level in which the electron originated? I am halfway through, but uncertain as to how to simplify the problem to completion. (6.63 x 10^-34 J x s)(1.14 x 10^14 s^-1)= -2/18 x 10^-18 J x [1/4^2 - 1/ninitial^2)
(Neglect volume changes.) [PO43-] = M. (b) Which cation precipitates first? Ag+ Cu2+ (c) What is the concentration of PO43- when the second cation begins to precipitate? [PO43-] = M.
A gaseous mixture of O2 and N2 contains 30.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 505mmHg ?
The two objects have the same mass. If they are to have the same total kinetic energy, what should the ratio of the cylinder's angular speed to the spherical shell's angular speed be?
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOH C6H5COO- + H+
The enthalpy of vaporization of water at 373 K and 1 bar is 40.7 kJ/mol and the molar heat capacities are 75.3 J/(mol K) for liquid and 33.6 J/(mol K) for gaseous water. Find the enthalpy of vaporization of water at 273 K and 1 bar.
Orange juice is an aqueous solution that derives much of it's acidity from citric acid. There are variations in the acidity of each brand depending on many factors
Formic acid, CH2O2, can be decomposed to produce hydrogen. The Lewis structure for formic acid, CH2O2, is show below. The atoms are labeled A, B, C, D, E.
calculate what volume of each 0.50M solution should be mixed to give a total volume of 50.0mL AND the reactants in the correct stoichiometry. Also write a data table in the space given
If 7.85 x 10 to the 24th power Sc atoms react with excess CaO, how many grams of each product will form? You will need to determine the equation of the reaction.
Draw a structural representation to describe the H-bonding responsible for the high boiling point of ethylamine and the structural representation of the H-bonding present when ethylamine dissolves in water.
a fuel oil is composed of C10H22 and C12H26 when the fuel oil ios burned with 20% excess air the ratio of water to CO2 is found to be 1.088.
What is the pH of the solution during the titration when the following volumes of the NaOH have been added to 34.5-mL of the acid.
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