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calculate the wavelength of the fifth line in the hydrogen atom paschen series. calculate the energy released in the transition
A solution of phosphoric acid was made by dissolving 10 g of H3PO4 in 100 ml of water. The resulting volume was 104 mL. Calculate the density, mole fraction, molarity, and molality of the solution. Assume water has a density of 1.00 g/cm3
NaOH is added to 625 mL of 0.250 M weak acid (Ka = 5.62 × 10-5). What is the pH of the resulting buffer?
a turbine operates by the impact of a high velocity jet of steam against the turbine blades. The steam leaves the turbine at a lower velocity. For the turbine depicted, steam from a high pressure nozzle enters the air and strikes the blades of a t..
How many kJ of energy are required to convert 258 grams of ice at 0°C to water (liquid) at 42.1°C? The following information is given for H2O.
The reaction AB-> A+b is second order in AB and has a rate constant of 0.0245 M^-1 S^-1 at 25.0 degree celcuis . A reaction vessel initially contains 250.0 mL of 0.108 M AB which is allowed to react to form the gaseous product.
Model symmetry, Construct a model* in which a tetrahedral (sp 3) carbon atom (black) has four different model atoms attached to it. Use the light blue ball, red, blue
It is known that the Co2+-ligand complex obeys the Beer-Lambert Law. Calculate the mass percentage of the cobalt in the original sample.
How much heat is released when 105 g of steam at 100 Co is cooled to ice at -15Co? the enthalpy of vaporization of water is 40.67 KJ/mol, the enthalpy of fusion for water is 6.01KJ/mol,
A 283-g sample of nickel at 100.0°C is placed in 100.0 mL of water (density = 1.00 g/mL) at 22.0°C. What is the final temperature of the water?
A dark glass bottle of chemicals is found in cleaning out an old basement. Part of the label has been eaten away with age. Only the last part of the label is readable.
What was the theoretical yield of 1-octanol under these conditions? Nancy was surprised to find that her gas chromatogram of the product mixture contained more residual 1-octene and more trialkylborane than was observed by the other students in he..
undergoes a uniform negative acceleration for 1.5 s, andthen comes to rest. Whatdoes the spring scale register (a)before the elevator starts to move?
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