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A ground state H-atom absorbs a photon of wavelength 94.38 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 3174 nm to reach an intermediate level, and a second to reach the ground state. What was the wavelength of the second photon emitted?
How do the pHs of the buffered solutions compare. Explain. How do the buffering capacity of the two solutions compare. Explain
Determine the final pH of a solution that is prepared by mixing 25 mL of 0.15 M sodium hydroxide( NaOH )with 20. mL of 0.20 M HA,( a weak acid with Ka = 2.3 x 10-6)?
You burn 0.0956 g of the compound and isolate 0.1356 g of CO2 and 0.0833 g of H2O. What is the empirical formula of the compound.
A solution is 0.1 mM in NaF, Na2CO3, and Na3PO4. What would be the order of precipitation as a source of Ca2+ is added gradually to the solution? The relevant Ksp values are Ksp [CaF2] = 4.0×10-11, Ksp[CaCO3] = 8.7×10-9, Ksp[Ca3(PO4)2] = 1.3×10-32..
calculate the osmotic pressure associated with 50.0 grams of an enzyme of molecular weight 98,000 g/mol dissolved in 2600 mL of benzene at 30 celsius
What are the respective concentrations (M) of Mg+2 and C2H3O2- afforded by dissolving 0.600 mol Mg(C2H3O2)2 in water and diluting to 135 mL
Compute the change in temperature when 1 g sodium chloride is dissolved in 250.0 mL of water is initially at 27 C. The heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
One plate was placed in a chamber containing methanol, and after developed it showed one spot with an Rf value of 0.97. The other plate was placed in a chamber containing hexane
Consider the following balanced equation: 2 N2O5 → 4 NO2 + O2. If a 5.00 g sample of N2O5 undergoes this reaction, how many grams of O2 will also be formed?
25.00 ml of 0.030 m dipotassium oxalate is titrated with 0.100 m hclo4. at what volume of hclo4 being added is the
A water sample is measured to have alkalinity of 130 mg/L as CaCO3 at pH=9.2, what are the concentrations of the three carbonate species
The solubility of pure nitrogen in water at 1 atm and 25 degress Celsius is 6.8E-4 M. Calculate the concentration of nitrogen in water under atmospheric conditions where the partial pressure of nitrogen is 0.78 atm.
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