What is the percent abundance of each isotope
Silver has two stable isotopes with masses of 106.90509 amu and 108.9047 amu. The average molar mass of silver is 107.868 amu. What is the percent abundance of each isotope?
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How many grams of riboflavin (molecular mass = 374.6g/mol) are required to prepare a 1.00L solution that is 5.00 x 10^-5 M
Calculate the vapor pressure at 25 degrees C of an aqueous solution that is 5.50% NaCl by mass. The pure vapor pressure of water at this temperature is 23.78 torr.
What mass of C2H5OH should be added to 620kg of the paraffin in formulating the mixture if the vapor pressure is of ethanol at 35 degrees C over the mixture is to be 8 torr? The vapor pressure of pure ethanol is 35 degrees C is 100 torr
For each of the following situations, state if the amount of each of the constituents of this system (C(s), H2(g), and CH4(g)) show an increase, decrease, or if it stays constant as the system comes back to equilibrium.
Calculate the mass of vapour present in a room of volume 250 meter cube that contains air at a temperature of 23 degree centigrade on a day when the relative humidity is 53%.
A sample was placed on a chromatography column. Methylene Chloride was used as the eluting solvent. No seperation of the components in the sample was observed.
Which is more difficult: removing the valence electron from Potassium or removing the valence electron from sodium after the latter has been excited to the 4s level? Why?
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. If 0.560 moles of a monoprotic weak acid
A buffer is prepared by mixing 295 mL of 0.210 M HCl with 584 mL of 0.559 M ammonia (NH3). Given that the Kb of NH3 is 1.8 x 10-5, calculate the pH of the solution.
Before investigating the scene, the technician must dilute the luminol solution to a concentration of 6.00×10^?2 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are
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