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Explain the concept of the mole qualitatively, either using ananalogy, or explaining what a mole of a substance actually is, and why the amu mass of an atom of an element is the equivalent mass ingr
What value would you plug into for ΔHf? Would it be-528.3kJ/mol? or would you have to multiply that number by 2 sincethere are 2 moles of C4H10(NO2)2?
The element indium (In) is to be obtained by electrolysis of a molten halide of hte element. Passage of a current of 3.20 A for a period of 40 min results in formation of 4.57g of indium.
What is the frequency in Hz of the photon released when a hydrogen atom undergoes a transition from the excited state where n = 6 to the state where n = 3?
Calculate the molarity of a sodium hydroxide if 39.73 mL ofthe solution is needed to neutralize 122 mL of 0.483 Moxalic acid. The equation for the reaction is?
What is the half-life in minutes of a radioactive nuclide if 1/32 nd of the original sample remains after 84.0 min?
The rock in a lead ore deposit contains 84% pbs by mass. How many kg of the rock must be processed to obtain 1.0 kg of pb?
Metallic copper is formed when aluminum reacts with copper(II) sulfate. How many grams of metallic copper can be obtained when 54.0 g of Al react with 319 g of CuSO4?
Calculate the molarity of a sodium hydroxide if 48.72 mL ofthe solution is needed to neutralize 192 mL of 0.378 Moxalic acid. The equation for the reaction is?
Calculate the volume of 2.44M sulfuric acid that would be needed to neutralize 45.3 mL of a 2.57 M aqueous ammonia solution. The equation for the reaction is?
A new indicator dye, HIn, is to be tested for a pKa experiment. In .100 M acetate buffer (pH = 4.00), the dye is20% In- (base) and 80% HIn (acid). In other words, the pKa is4.60.
In what ways would a knowledge of the global wind belts have helped a sixteenth-century explorer sailing between Spain and the northern part of South America?
The air in a laboratory was measured with a barometer to be 7.40x 102 mm Hg. What is the laboratory air pressure in atm?
A common shorthand way to represent a voltaic cell is to list its components as follows: anode/ anode, solution ll cathode, solution/ cathode. A double vertical line represents a salt bridge or poro
What is the age of the piece of wood in years ? The decay rate of carbon-14 in fresh wood today is 13.6 counts per minute per gram, and the half life of carbon-14 is 5730 years.
The element indium (In) is to be obtained by electrolysis of a molten halide of the element. Passage of a current of 3.20 A for a period of 40.0 min results in formation of 4.57 g of indium. W
You are operating an instrument that pulls air through a particle filter at a flow rate of 16.7 L/min (1 m^3/hr). There is animpactor upstream of the filter that removes particles with aerodynamic d
Determine how many CoCl3 formula units can be produced from are action mixture containing 525 cobalt atoms and 525 HCLmolecules according to the following reacton
Weekly samples of wet acid deposition were collected for a 1-month period. Calculate the average pH and determine how many more times acidic the average sample is than a theoretical clear air sampl
Ammonia gas combines with excess oxygen gas to produce nitric oxide and water. If 256 kJ of energy were released in such a reaction, how many grams of ammonia gas were reacted?
To obtain water each day , a bird in the winter eats 5.00 g of snow at 0 degree C. How many kilocalories of energy does it take to melt this snow and warm the liquid to the body temperature of the b
The cells used in absorbance measurements are usuallycalibrated so that the pathlength is accurately known and constant for all measurements.
Calculate the concentration of an aqueous KCl solution if 353 mL ofthe solution gives 33.0 g of AgCl when treated with excess AgNO3.
Auto mobile batteries are filled with sulfuric acid. What is the mass of the acid (in grams) in 5.00 x 102 mL of the battery acid solution if the density of the solution is 1.285 g/cm3 and if the so
Mercury, water and bromine are all liquids at standard temperature. Their molar entropies are in the sequence H2O < Hg< Br2. Using molecular properties, explain why bromine is more disordered