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The energy needed to ionize an atom of Al when it is in its most stable state is 577.6 kJ mol-1. However, if an atom of Al is in a certain low-lying excited state, only 274.4kJ mol-1 is needed to ionize it. What is the wavelength of the radiation emitted when an atom of Al undergoes a transition from this excited state to the ground state?
determine the average separation distance between the quantum dot and an adjacent gold nanoparticle for the molecular beacon (in the absence of the target sequence).
Hypohalic acid, HOX, is a weak acid with a Ka of 3.341x10-8. What is the pKb for the hypohalite anion, OX-, in a 0.8865 M solution of KOX
A+2B 2C Kc=2.93 2C D Kc=0.288 calculate the value of the equilibrium constant for the reaction. D A+2B
If 3.8kcal of energy is released when 1 gram of glucose is combusted, how many kcals are released when 0.689 moles of glucose are combusted
What is the rate constant for a) a zero order reaction, b) a 1st order reaction, c) a 2nd order reaction, and d) a 1/2 order reaction? All concentrations are expressed in molarity
Compute the theoretical yield of aspirin to be obtained when 1.5 g of salicylic acid as well as 4.0 ml of acetic anhydride (density= 1.08 g/ml) are mixed together. Molar masses- acetic anhydride= 102.1 g/mol; salicylic acid = 138.1 g/mol.
What is the purpose of the hydrochloric acid and the sodium acetate in this reaction
1. what structural characteristics of polystyrene polyacrylonitrile and polytetrafluoroethylene have an effect on the
David J hooper weighs out 13.1 grams of salicylic acid in a 250 mL flask and adds 7.5 mL of acetic anhyride (density=1.080 g/mL) Determine the max (theoretical number of grams) of acetlysalicylic acid he can prepare
Explain why most of the difference in omega-3 PUFAs in Alaskan salmon are seen in the phospholipid component of the fish rather than in the triglyceride component of the fish
Three sparingly soluble salts, MA, MA2, and MA3, all have Ksp = 1.5 x 10-7. Determine which of these three has the highest molar solubility in water? a) MA, b) MA2, c) MA3 ,d) They are all equally insoluble.
Calculate the standard emf of a cell that uses Mg/Mg2+ and Cu/Cu2+ half-cell reactions at 25°C.
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