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A 25 mL sample containing Cu2+ gave an instrumentsignal of 23.6 units (corrected for a blank). When exactly 0.5 mLof 0.0287 M Cu(NO3)2 was added to thesolution, the signal increased to 37.9 units. Calculate the molarconcentration of Cu2+ assuming that the signal was directly proportional to the analyte concentration.
A gaseous mixture of O2 and N2 contains 39.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 585mmHg
The contents of one 40-lb bag of topsoil can cover 10.0 square feet of ground to a depth of 1.0 in. How many bags are needed to cover a plot that measures 200.0 meters by 300.0 meters to a depth of 4.0 cm?
Urea is an organic compound widely used as a fertilizer. its solubility in water allows it to be made into aqueous fertilizer solutions and applied to crops in a spray. what is the maximum number of water molecules that one urea molecule can hydrog..
water from 20 degrees Celsius to 100 degrees Celsius. What is the delta H of combustion of the propane. What is the sign (positive or negative) of delta H?
Cesium-131 is a short lived radioisotope (t 1/2 = 9.7 days) used to treat prostate cancer. How much therapeutic strength does a cesium-131 source lose over 45.0 days?
Given that the pKa for Acetic Acid is 4.77, calculate the expected pH of the buffer solutions using the Henderson-Hasselbalch equation and the concentrations of Acetic Acid and Acetate added to the 250 ml Erlenmeyer flask.
a student mixes four reagents together thinking that the solutions will neutralize each other. the solutions get mixed
The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the cesium atom. Calculate the wavelength of this radiation
Organic Reactions - Cyclopentadiene, Why is cyclopentadiene monomer more stable at higher temperatures although dicyclopentadiene (dimer) is more stable at lower temperatures?
Write the names of the enzymes that are involved in the biosynthesis of RNA and indicate the specificity of each enzyme
Sulfur trioxide dissolve in water, producing H2SO4. How much sulfuric acid can be produced from 13.5 mL of water and 26.1g of SO3?
why does ch3-ch2-o-h have a higher boiling point than ch3- o-ch3 even though they have the same molar mass? use
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