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Why is it necessary to add sodium chloride to the steam distillate before carrying out ether extraction?
What mass of F2 is needed to produce 167 g of PF3 if the reaction has a 77.0% yield?
1. calculate the mass in grams for a sample of al that absorbs 1.70kj when the temperature increases from 56 degree
the calculation of the Ksp value be affected if the endpoint of titration was surpassed (i.e. too much HCl was added)?
At this temperature iron is in the BCC form and will dissolve (interstitial) carbon up to about 0.001 wt%. If the criterion is that the carbon concentration equals 0.0002 wt% carbon at a depth of 100 microns, how long must the exposure be?
Describe how a phospholipid differs from other fatty acids. How does this difference allow the formation of a bilayer in an aqueous medium
a tightly sealed 5 litres flask has argon ar at 6.28x101 deg. c and 781 mm hg. determine the temperature of the gas if
What is the final pH of the solution when 15.0 mL of 0.121 mol/L NaOH(aq) and 35.0 mL of 0.181 mol/L HNO2(aq) are mixed? Assume the temperature is 25oC.
There is a horizontal line representing the separation point between the liquid phase and the gas phase in the middle of the container. Use Xs to represent the 25 molecules in each container and place those molecules where you would expect them to..
What is the pOH of a solution that is prepared by mixing 25.0 mL of 0.200 M HNO3 and 25.0 mL of 0.150 M KOH
Which of the following wave functions are eigen functions of the operator d^2/dx^2? If they are eigen functions what is the eigen value? b) sin (2?x/a)
water skier is pulled by a net force of 180 N and has an acceleration of 2.4 m/s2. What is the mass of the skier?
Explain in general terms what a reference sample is and what its purpose is in spectrophotometry.
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