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A ground state H-atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energylevel. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate level, and a second to return to the ground state.
a. What higher level did the electron reach? (Ans. n = 5)
b. What intermediate energy level did the electron reach? (Ans. n =3
c. What was the wavelength of the second photon emitted? (Ans. 1.02 x 10-7m)
What is molecular weight of a gas that effuses 1/4 as rapidly as CH4? I need to know how to SOLVE the problem. The answer should be 256.
for many material applications the mass density is an important parameter particularly in the transportation industry.
The reaction 2COF2 (g) CO2 (g) + CF4 (g) has an equilibrium constant of Kc = 2.20x10^6 at 292 K. Determine the value of the equilibrium constant for the reaction 2CO2 (g) + 2CF 4 (g) 4COF2 (g)
Define A mixture of benzoic acid, benzyl alcohol, and biphenyl is spotted on a silica gel TLC plate and developed in a dichloromethane-cyclohexane solvent mixture. Forecast the relative Rf values for the three components in the sample.
What would be the mathematical sign for the energy change (positive for endothermic or negative for exothermic) for each of the following processes. Explain the reasoning for each choice:
If 0.340 mol of a nonvolatile nonelectrolyte are dissolved in 3.00 mol of water, what is the vapor pressure of the resulting solution? (The vapor pressure of pure water is 23.8 torr at 25.0 °C.)
1. so2 reacts with h2s as followsnbspnbspnbspnbspnbspnbspnbspnbspnbspnbspnbspnbspnbspnbsp 2h2s so2 rarr 3s 2h2owhen
according to the given reaction c2h5oh3o2 reacts with 2co23h2o a 35.6g sample of ethanol c2h5oh is burned a bomb
450 L sample of a gaseous compound at 72.5 cm of hg pressure and at 1.00*10^2 has a mass of 1.86 g. what is the molecular weight of the compound
Which of the following ideal aqueous solutions would be predicted to have the highest vapor pressure. 2.00 m MgBr2
Equal volumes of 0.190 M weak base (Kb = 2.5× 10-9) and 0.190 M HCl are mixed. Calculate the pH of the resulting solution.
A 50.00ml solution of the acetylsalicylic acid HC9H7O4 is titrated with 0.1000 M KOH. It needed 22.08 ml of KOH to reach the equivalence point of the titration. Ka = 3.0x104
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