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The Pickering Series is a set of transitions of He+ first observed in the spectrum of the hot star Zeta Puppis in1896 to the n=4 level from higher energies. Compute the wavelength in nm of the first four lines in this series. Bonus a reason why people were primarily confused by these spectral lines?
What is the partial pressure in atm of N2 of ths mixture if it is held in 12.60-L vessel at 15 degrees celcius. What is the partial pressure in atm of H2 of this mixture if it is held in a 12.60 -L vesssel at 15 degrees celcius
To what volume must a solution of 84.1 g H2SO4 in 534.7 mL of solution be diluted to give a 0.41 M solution
How many grams of sucrose (C12H22O11, 342.3 g/mol) would be needed to make 2.5 L of a solution with an osmotic pressure of 14 atm at 25°C? (R = 0.0821 L×atm/K×mol) A) 0.57 g B) 6.8 g C) 2.0 × 102 g D) 4.9 × 102 g E) 5.8 × 103 g
Calculate the concentrations of all species in a 1.73 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
KCL,KCLO3, and MnO2 having a total wight of 23.584 was jeated tp decompose the KCLO3. After heating, the mass was found to be 22.347g. how many moles of oxygen gas was evolved.
if you make a mistake and deliver less than 50.00 ml of hcl to the erlenmeyer flask what effect will this have on the
The following reaction is exothermic (H= -226 kJ) and has a rate law: Rate = k(NO2)^2: NO2 + CO ? NO (g) + CO2 (g) for each of the following disturbances, indicate whether the rate of the reaction will be FASTER or SLOWER and indicate whether ther..
A 2.00L flask originally containing 0.500M disulfur decaflouride is allowed to reach equilibrium and found to contain 0.023M disulfur decaflouride. If an additional 0.125mol of the disulfur decaflouride is added and equilibrium re-established, wha..
Write the balanced chemical equation for this acid-base reaction, identifying theconjugate acid/base pairs. If the base-dissociation constant of B is 1 × 10−3, what is the pH at the midpointof the bu?er region. What are the chemical components of t..
There is a titration of 25.00 mL. The equevalence point is reached after 18.50 mL of 0.171 M HCl has been added . What is the initial concentration of ammonia in the solution? what is the pH of the solution at the equivalence point
the enthalpy of combustion of c12h22o11is -5652 a 2.5 g sample of lactose was burned in a calorimeter that contained
verify the law of multiple proportions for an element x which forms oxides having percentages of x equal to 77.4
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