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The molecular weight of a compound is the sum of the atomic mass of its atoms. Compound X has a molecular weight of 522 daltons and is known to consist of equal numbers of C, O, and H atoms
Calculate the change in ph when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in NH4Cl.
Calculate the expansion work done against a constant external pressure of 0.999 atm and at a constant temperature of 24°C. Assume that the initial volume of dry ice is negligible and that CO2 be
Consider a diploid organism with 3 pairsof chromosomes (A, B and C from the mother and A', B'and C' from the father), What proportion of gametes would only have maternal chromosomes
In the laboratory you dissolve 16.7 g of barium chloride in a volumetric flask and add water to a total volume of 125 mL. What is the molarity of the solution
A 20.00-mL sample of 0.150 M KOH is titrated with 0.125 M HCIO4 solution. Calculate the pH after the following volumes of acid have been added.
List a possible sequence of events and describe the energy transformations that take place between the sun's light hitting the earth and the light reaching you from an electric light bulb
As food manufacturers add vinegar to food preparations to make them tart, rather than pure acetic acid,
at 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00 x 10^3 L mol -1cm1-. Calculate
what mass of carbon tetrachloride,CCl4, must be vaporized at 100 degrees celsius to fill a flask with a volume of 275.0 ml when the atmospheric pressure is 753.9 torr. If the experiment is repeated
During a Heck reaction Palladium, from palladium acetate, undergoes a change in oxidation state. Define what is being oxided and reduced through mechanism
How do the enthalpy of dissolution, the crystal lattice energy, and the solvation energy of the two salts relate to these experimental observations?
A student constructs a galvanic cell that has a strip oflead metal immersed in a solution of 0.1M Fe(NO3)2 as one half-cell and a strip of zincmetal immersed in a solution of 0.1M Zn(NO3)2 Which hal
When using a normal polyacrlamide gel or native gel the distance that a protein travels through the gel is not neccessarily proportional to the molecular weight of the protein
A solution is prepared by dissolving 0.18 moles of acetic acid and 0.18 moles of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.
If 0.015 M NaCl shows conductivity of 12,000 units, based on "total ion concentration" what conductivity should be observed for 0.030 M Na2SO4?
what is the pOH of a solution prepared by adding 2.88 g of sodium nitrite, NaNo2, to 135mL of water? ka of HNO2 is 4.5x10^-4.
Poly(propylene) is made of one kind of monomer. Give the two monomers used to make nylon 6,6. Why are two monomers needed to make nylon 6,6 while only one is needed to make poly(propylene)?
What is an allele, What is the krebs cycle and where does it take place and what does it do, Give an overview of Evolution, Give an overview of mitosis
a specific heat of 0.061 cal/g C and at a temp of 99.1C is added to 85.0 grams of water at 23.5C What will be the final temp of the water when equilibrium is reached?
A particular metal has a specific heat of 0.061 cal/(g C). How much heat must be lost from 25.00 grams of this metal for the temp to drop 65.2C
The particles are in constant motion. The collisions of the particles with the walls of the container are the cause of the pressure exerted by the gas.
Propose mechanisms for the formation of fragments with m/z 69, 43 and 41 in the mass spectra of CH3CH=CHC(O)CH3 and briefly explain the absence of fragments from the McLafferty rearrangement.
If a Primary Structure of a protein contained charged areas and hypdrophobic areas, describe how that protein would fold and a hydrophic amino acid was substituted for a charged amino acid
Using the Henderson-Hasselbach equation, calculate the volume of 0.10 M Na2HPO4 and 0.10 M NaH2PO4 that would be required to make 100.0 mL of a 0.10 M (total phosphate concentration i.e. HPO4 + H2PO4)