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What is the wavelength, in nanometers, of the light emitted when the electron in a hydrogen atom drops from the energy level n_i = 12 to n_f = 5?
A buffer solution is composed of 1.360 g of KH2PO4 and 5.677 g of Na2HPO4. What is the pH of the buffer solution?
Calculate the lattice energy of RbCl using the following data: Rb(s) => Rb(g) ?H = +86 kJ/mol Rb(g) => Rb+(g) + e- ?H = +409 kJ/mol Cl2(g) => 2Cl(g) ?H = +242 kJ/mol Cl(g) + e- => Cl-(g) ?H = -355 kJ/mol Rb(s) + 1/2 Cl2(g) => RbCl(s) ?H = -435 kJ/..
If you prepare a liter of 0.02 M acetic acid and 0.01 M sodium acetate, what will be the pH if the pKa of acetic acid is 4.76? b) If you add 1 ml of 5 M NaOH to the 1 liter above, what will be the new pH and the change in pH?
A piece of copper alloy with a mass of 60.0 g is heated from 21.0 ?C to 44.0?C. In the process, it absorbs 507 J of energy as heat. What is the speci?c heat of this copper alloy.
The united states FDA requires that any product called vinegar contains at least 4% by weight of acetic acid. assuming that the density of vinegar is the same as water
the synthesis of ammonia via the haber reaction follows the balanced equation3 h2g n2greg 2 nh3gdh -99.22 kjhow much
Typical rate of deposit of dust (dustfall) from unpolluted air was reported as 10 tons per square mile per month. Express this dustfall in milligrams per square meter per hour.
Calculate the pH if .2 mol HCl is added to.5 L of a butter solution that is .28 M NH3 and .22 M NH4CL. For NH3, the Kb=1.8x10^-5
MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg^2+ ion as nearest neighbors
Indicate which layer( aqueous or organic) each component in the reaction will mainly reside in ( for both products and reactants ) for all the following three reactions: (1)Show the reaction of 1-naphthylamine hydrochloride with sodium hydroxide.
How would you prepare 350mL of a single solution containing 150mM Tris, 5mM glucose, and 5 mM Nacl?
calculate the number of grams of isopropyl alcohol rubbing alcohol c3h8o which must be added to 275 g of water to
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