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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?
The B4O5(OH)4^2- ion, present in 5.0 ml of a saturated Na2B4O5(OH)4 solution at a measured temperature, is titrated to the bromocresol green endpoint with 6.51 mL of 0.146 m HCl. How many oles of B4O5(OH)4^2- are present in the sample
If you know the answer please give units :) Part A: The reactant concentration in a zero-order reaction was 5.00×10^?2M after 140s and 3.00×10^?2M after 300s. What is the rate constant for this reaction? -> For this I got that 1.25x10^-4M/s, whic..
A beaker with 145mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M
If a bottle of nail polish remover contains 181 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL.
A sample of ideal gas at room temperature occupies a volume of 34.0L at a pressure of 722 torr. If the pressure changes to 3610 torr, with no change in the temperature or moles of gas, what is the new volume, V2
The amount of nitrogen in an organic subsxtance can be determined by an anlytical method called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia.
The volume of the gas collected is 500 ml. What mass of oxygen is collected. The vapor pressure of water at 25 degree celsius is 23.8 torr
What is the pH of a solution that is known to be 5.58 M in H3PO4. What would be the approximate concentration of PO43-(aq) in that solution
A patient's blood test shows that she has elevated levels of LDL (low density lipoproteins) at 4.12 mmol/L. Convert this concentration to units of molarity (mol/L)
Write the balanced equation. BaCl2(aq) + 2AgNO3(aq) ? 2AgCl(s) + Ba(NO3)2(aq) b. What mass of AgNO3, in grams, is required for complete reaction with 0.156 g of BaCl2? What mass of AgCl is produced? 0.156 g BaCl2 0.2547 g AgNO3 0.2149 g AgCl Are t..
An object will sink in a liquid if the density of the object is greater than that of the liquid. The mass of a sphere is 9.83 g. If the volume of a sphere is less than ________cm3, then the sphere will sink in liquid mercury( density= 13.6 g/cm3)
(heatcapacity of water : 4.184 j/g/k) if the final temperature of the system is 30c, what is the specific heat capacity of the alloy
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