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A 25.0ml aliquot of an aqueous quinine solution was diluted to 50 ml and found to have an absorbance of 0.832at 348nm when measured in a 2.00cm cell. Asecond 25.0ml aliquot was mixed with 10.00ml of a solution containing 23.4ppm of quinine ; after dilution to 50.0ml this solution had an absorbance of 1.22(2.00 cm cell) calculate the concentration in parts per million of quinine in the sample
A sample of gas is heated. During the heating process, the volume of the gas increases 1.7 times. If the initial temperature of the gas is 80°C, what is the final temperature of the gas.
Can someone explain how to determine if the cis or trans isomer is optically active for [Cr(NH3)2(ox)2]-And please show the isomers drawn so i can see if i have drawn them correct.
The solubility product of PbBr2 is 8.9x10^-6. Determine the molar solubility a) in pure water, b) in 0.20M KBr solution, c) in 0.20M Pb(NO3)2 solution.
Compound A is C4H9Cl and shows two 13C NMR resonances. Compound B is an isomer of compound A; it shows four 13C NMR resonances, and in the spin-coupled mode the resonance farthest downfield is a doublet. Identify compound A
Determine the molecular formula of an unknown perfect gas composed primarily of Nitrogen and Oxygen. At -3 degrees Celsius and when the pressure is 101.325kPa the density is 1.354 g/L.
If the partial pressure of oxygen drops below 100.0 mmHg, passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped
when 15.12 ml of 0.1194 M NaOH is added to 25 ml of 0.1264 M HX(an unnknown weak acid),the resulting pH is 5.9 . what is the ka of the unknown acid
How many grams of ammonium chloride are formed when 46 grams of calcium chloride react with 64 grams of ammonium nitrate
The volume of a sample of chlorine gas is 98.6 mL at 31.4 C and 769.6 mmHg. What volume will the sample occupy at 23.2 C and 748.8 mmHg? Please show how to work out the problem if you can
if the molar enthalpy of water is 6.009 kjmol how much energy is needed for 4.5 moles of ice to melt at
Calculate deltaH degrees for each of the following reactions: 4Na(s)+O29g) 2NaO(s) 2Na(s)+2H2O(l) 2NaOH(aq)+ H2(g)
methane ch4 ammonia nh3 and water h2o all have octets around the central atom yet they have different shapes and bond
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