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Rydberg equation to calculate the frequency of a photon absorbed when the hydrogen atom undergoes a transition from n1 = 2 to n2 = 4. (R = 1.096776 × 107 m-1; c = 3.0 x 108m/s.
What is the density of lead (in ) if a rectangular bar measuring 0.500 in height, 1.55 in width, and 25.00 in length has a mass of 220.9?
Which of the following is not true regarding social development?
If the copper is drawn into wire whose diameter is 8.50 , how many feet of copper can be obtained from the ingot? The density of copper is 8.94 .
Write the net ionic equation for the following two-step process. Include states of matter in your answer.
Determine the osmotic pressure of a solution that contains 0.037 g of a hydrocarbon solute (molar mass = 340 g/mol) dissolved in benzene to make a 350-mL solution. The temperature is 20.0°C.
A 343 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 625 mmHg. Calculate the moles of Ar present.
If the titrant has a molarity of 0.2750 M and there are 25.00 mL of analyte present, what is the molarity of the analyte?
A weather baloon with 2 meter diameter at ambient temp holds 525 grams of helium what type of electronic probe could be used to determine the pressure inside the balloon.
Terephthalic acid is composed of C, H and O. When 0.6943 g of tetephthalic acid is subjected to combustion analysis, it produced 1.471 g CO2 and 0.225 g H2O. What is its empirical formula?
A particular gaseous hydrocarbon that is 82.7% C and 17.3% H bymass has a density of 2.33g/L at 23oC and 746 mmHg. What is the molecular formula of this hydrocarbon?
What is the anticipated mass of product "P" (assuming 4 NH3 ligands)? The product formula of "P" with four ligands is [Co(NH3)4Cl2]Cl.
At 521 K the value of Kp for the equilibrium represented by the balanced equation is 1.07 x 100. Calculate the value of Kc at the same temperature. Express answer in scientific notation.
Use tabulated thermodynamic data as needed to calculate ΔHf° for the reaction product in the equation shown below if ΔH° for the reaction is -79.46 kJ.
A mixture of methane and ethane is stored in a container at 294 mmHg. The gases are burned in air to form co2 and h2o. if the pressure of co2 is 357 mmhg measured at the same temperature and volume
A 32.65-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 54.00 mL. The solid and tol
If the initial concentration of {AB} is 0.260 M, and the reaction mixture initially contains no products, what are the concentrations of {A} and {B} after 75 s?
A 3.00-L flask is filled with gaseous ammonia,NH3 . The gas pressure measured at 20.0 deg C is 2.05 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?
You need to produce a buffer solution that has a pH of 5.02. You already have a solution that contains 10 rm mmol (millimoles) of acetic acid. H
A graduated cylinder contains 24.0 mL of water. What is the new water level after 38.8 {rm g} of silver metal with a density of 10.5 g/mL is submerged in the water?
A mixture of KBr and NaBr weighing 0.560 gm was treated with aqueous Ag+ and all the bromide ion was recovered as 0.970 gm of pure AgBr. What was the fraction by weight of Kbr in the original sample
A 36.3 ml aliquot of 0.0529 M H2SO4 (aq) is to titrated with 0.0411 M NaOH (aq) What volumen (ml) of base will it take to reack the equivalence point
If a 2.4 reaction vessel initially contains 721 of cyclopropane at 485 , how long will it take for the partial pressure of cylclopropane to drop to below 104?
Given the osmotic pressure of the solution was 1.50 x 10-3 atm and the temperature is 298.0K, calculate the molar mass of the protein.
(a) What is the change in pH when [OH -] increases by a factor of one hundred? (b) What is the change in [H3O+] when the pH decreases by two units?