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When an electron in an excited molybdenum atom falls from the L to the K shell, an X-ray is emitted. These X-rays are diffracted at an angle of 7.75° by planes with a separation of 2.64 Å. What is the difference in energy between the K shell and the L shell in molybdenum assuming a first-order diffraction?
For the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluble salt.
Question- You is given two samples of two shiny metals, one is silver (Ag) and the other is aluminum (al). Suggest tests which you would carry out in lab to determine the identity of each sample.
What is the volume occupied by 24.7g of argon gas at a pressure of 1.38atm and a temperature of 346K
Problem- A mixture contains both potassium phosphate and potassium chloride. What is the percentage of potassium phosphate in this mixture if reaction of 0.401 g of this mixture with excess copper ii chloride yields 0.213 g of copper ii phosphate?..
In a qualitative analysis procedure, a chemist adds HCl to an unknown group of ions and then saturates the solution with H2S so that the solution is 0.2 M in HCl and 0.10 M in H2S.
a 125 g metal block at a temperature of 93.2 Celsius degree was immersed in 100. g of water at 18.3 celsius degree. given the specific heat of the metal (Cp = 0.900 J/g Celsius), find the final temperature of the block and the water.
a gas company in massachusetts charges 1.30 for 15ft cubed of natural gas ch4 measured at 20 degrees celsius and 1.0
Calculate x, the number of molecules of water in oxalic acid hydrate(H2C2O4-xH20), from the following data:5.00 g of the compound is made up of exactly 250 mL solution, and 25.0 mL of this solution requires 15.9 mL of .500M NaOH solution for neutr..
A trial of this decomposition experiment, using different quantities of reactants than those listed in the question above produced the following data: Volume of O2 produced at room conditions
What effect will adding some C have on the system? What is the change in entropy?
Calculate the mass of gasoline (in kg) needed to fill up a small tank which has a capacity of 3.0 L. Assume that the density of gasoline is 0.80 g/mL
A buffer is prepared by mixing 500 ml of 0.4 M Na2HPO4 and 500 ml of 0.2 M NaH2PO4 (pK1 = 2.10; pK2 = 6.70; pK3 = 12.30). Calculate the pH of this buffer.
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