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1. A cylinder with a movable piston contains 2.00 g of helium. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 L to 2.70 L? (The temperature was held constant.)
2. Circle the word that will make the statement correct.
a. As a piston compresses air in cylinder, the gas pressure increases/decreases.
b. As a balloon cools in a freezer, its volume increases/decreases.
c. As car drives on a highway, the tire pressure increases/decreases.
Consider the titration of 40.0 mL of 0.050 M of the fully protonated form of tryptophan with 0.10 M KOH. Calculate the pH of the solution at the following points
Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. First what is the initial pH (before any NaOH is added)
Based on the chemistry of an ion-exchange chromotography describe how you will calculate Mpc for your water samples.
Problem- We wish to prepare a buffer of pH 10 using common laboratory reagents. How many mL of 6M HCl would we have to add to a solution prepared by adding 100 mL of 15M NH3 to 200 mL of water? Ka of NH4 + = 5.70x10-10, pKa = 9.24.
what is the pH of the HF solution before base is added. 3) What is the pH at eqivalence point. 4) what is the pH at 1/2 volume to equivalence point.
Problem- Please provides the mechanism for the reaction of methyl propanoate with LiAlH4.
A 2.95 -g sample of an unknown chlorofluorocarbon is decomposed and produces 585ml of chlorine gas at a pressure of 748 mmHg and a temperature of 298K.
What is the pressure inside a 5.00 L vessel containing 0.0040 mol of nitrogen gas at a temperature of 23 degrees C
A hypothetical metal has a face-centered cubic unit cell with the edge length of 4.566 Å. Calculate the radius of the metal atom.
Explain what concentration of a competitive inhibitor characterized by K1=5.6 x 10-4 mol dm-3 will reduce the rate of formation of product by 75 per cent when the substrate concentration is held at 1.0 x 10-4 mol dm-3.
A race car traveling northward on a straight, level track at a constant speed travels 0.750 km in 20.0 s. The return trip over the same track is made in 25.0 s.
Problem- How many moles of HCl must be added to 100 mL of a 0.100 M solution of methylamine (pKb = 3.36) to give a buffer having a pH of 10.0
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