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What is the value of the reaction quotient, Q, for the cell that is constructed from the two half-reactions
Zn2+ + 2e- = Zn, Eo = - 0.76 V
Ag+ + e- = Ag, Eo = 0.80 V
when the Zn2+ concentration is 0.0100 M and the Ag+ concentration is 1.25 M?
A 1.25 x 10-2
B 8.00 x 10-3
C 125
D 6.40 x 10-3
E 156
Colbalt monoxide CoO, the blue color in ceramics glazes, is prepared by decomposing cobalt (II,III) oxide at 950degree celsius.
How many grams of dipotassium phthalate (242.3 g/mol) must be added to 700 mL of 0.175 M potassium hydrogen phthalate to give a buffer of pH 6.00?
patient if the recommended dose is 6.50 mg of aspirin per Kg of body weight? How many molecules does the patient ingest?
the solubility in water is 8.7 g per 100 mL at 20 degrees C and 34.2 g per 100 mL at 100 degrees C. Write the equation for the solubility equilibrium, including heat as a reactant or product. What is the sign of DeltaH of the solution
calculate the mass of CuS produced and the concentration of H+ ion produced by bubbling H2S into 1.00 L of 0.10 M CuCl2 (aq) solution. the net ionic equation
Calcium oxide (lime) reacts with carbon dioxide to form calcium carbonate (chalk). CaO(s) + CO2(g) ? CaCO3(s) ?H = -178.4 kJ (a) Is this reaction exothermic or endothermic?
Solubility constant for is 8.1E-12. When is in equilibirum with its ions in saturated solution. The concentration of silver ions.
What concentrations of [K2HPO4] and [KH2PO4] will you need to make the total concentration 0.50 M? 3.) How many moles of K2HPO4 and KH2PO4 will you need? 4.) What mass of K2HPO4 and KH2PO4 will you need?
when making ice cream, the temperature of the ingredients is decreased to below the freezing point of pure water by using a surrounding water bath that contains a large amount of table salt, NaCl.
A 4.80 g nugget of pure gold absorbed 279 J of heat. What was the final temperature of the gold if the initial temperature was 22.0°C? The specific heat of gold is 0.129 J/(g·°C).
degrees Celsius to a final volume of 34.6 L. During the expansion the gas cools to 12.0 degrees celsius. what is the final pressure?
Calculating the Equivalent Weight of an Unknown Substance, An unknown organic carboxylic acid, mp = 139-141 degrees Celsius, is burned with a yellow, sooty flame. The sodium fusion test showed that nitrogen was present.
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