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Emission spectral lines for Be^3+ has a wavelength of 253.4 nm for an electronic transition that begins in the state with n=5. What is the principle quantum number of the lower-energy state corresponding to this emission?
You have 0.3991 g of an unknown monoprotic acid, HA, which reacts with NaOH according to the balanced equation HA + NaOH ® NaA + H2O
what is the keq value for the acid base reaction between sulfuric acid and nitric acid? Assume that pka of the conjugated acid of nitric acid is -13.
Identify the conjugate base of CH3COOH in the following reaction
Which of the following acid-base pairs would work best for a laboratory experiment requiring a pH of 6.8? What molar ratios of the compounds would you use to prepare the solution?
What mass of C4H6 in grams is consumed in the reaction below when 36.9 grams O2 (g) are also consumed?
Which carboxyl group is more acidic in 3-chlorohexanedioic acid? The 2 carboxyl groups in 3-chlorohexanedioic acid are not equivalent and have different dissociation constants
1. Calculate the pH after 0.0 mL of KOH has been added. 2. Calculate the pH after 20.0 mL of KOH has been added. 3. Calculate the pH after 25.0 mL of KOH has been added. 4. Calculate the pH at the equivalence point. 5. Calculate the pH after 100.0..
If the C2 is bonded to 4 different groups and its mirror image is non-superimposable does it have optical activity
Calculate the change in enthalpy of this reaction. Specific heat of the solution = 4.184 J/(g oC) State your answer in kJ with 3 significant figures. Don't forget to enter the unit behind the numerical answer. The molecular weight of KOH is 56.2 g..
What is the partial pressure of ethane P ethane , in the flask? Express your answer to three significant figures and include the appropriate units
For such systems, it is often observed that the ratio of the vapor pressures of the pure species is nearly constant over a considerable temperature range. Let this ratio be r, and determine the range of values of A, expressed as a function of r, f..
What mass of calcium metal could be obtained from one kg of limestone that is 50.0% pure CaCO3?
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