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sodium borohydride,NaBH4, a substance used in the synthesisof many pharmaceutical agents,can be prepared by reaction of NaH with B2H6 according to the equation 2 NaH + B2H6 = 2 NaBH4. How many grams of NaBH4 can be prepared by reaction between 8.55 g of NaH and 6.75 g of B2H6? which reaction is limiting, and how many grams of the excess reactant will be left over?
Assuming the volume of the stomach to be 1.0L what will the pH change of the stomach acid resulting from the ingestion of one tums tablet
Calculate the concentrations of all species present [Na+], [C6H5CO2-], [C6H5CO2H], [H3O+] and [OH-] in 0.040M sodium benzoate
How many g of NaCl are required to prepare 250.0 mL of a 0.3440 M solution of NaCl in water?
how many moles are there of the reducing agent. What is the molarity of the reducing agent? Oxidizing agent --> KMnO4 Reducing Agent --> Fe +2 Volume of Fe +2 = 25 mL Concentration of KMnO4 = 0.1290 M
Titanium () chloride, a substance used in catalysts for preparing polyethylene, is made by high-temperature reaction of vapor with :2TiCkl4+H2 yielding 2TiCl3+2HCl. How many grams of are needed for complete reaction with 150 of at 450 and 785 pres..
The pH increased from 5.8, the normal pH of a cigarette , to pH 6.4 by addition of ammonia. How many moles of ammonia are required to produce this pH change per cigarette (volume approx. 5ml)?(Assume that no unprotonated ammonia will exist at pH 6..
Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol (46.07 g/mol)
An atomic emission spectrum of hydrogen shows the following three wavelengths: 1875nm, 1282nm, and 1093nm. Assign these wavelengths to transitions in the hydrogen atom.
The acid dissociation constant Ka equals 1.26 x 10-2 for HSO4- and is 5.6 x 10-10 for NH4+. Which statement about the following equilibrium is correct? HSO4-(aq) + NH3(aq) = SO4 2-(aq)+ NH4+(aq)
at 760 k 15 of a sample of cyclopropane changes to propene in 6.8 min. what is the half-life of cyclopropane at 760
Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10-5.
Explain why the absolute value of the work done by a process can never be greater than the absolute value of the Helmholtz free energy change.
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