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Describe the numeric relationship that exists between purine and pyrimidine bases in DNA molecules .
show whether the same is valid for RNA molecules.
Calculate the approximate freezing point of a solution prepared by dissolving 10.0 g of naphthalene (C10H8) in 300. g of cyclohexane. Pure cyclohexane freezes at 6.6°C. Kf of cyclohexane = 20.0°C/m.
The density of ocean water at a depth of 10,000 m is 1.071 g/mol and if 27 g of water at that depth contains 185 mg of potassium chloride, what is the molarity of potassium chloride in the sample
Determine whether each compound is an Oxide, Peroxide, Superoxide, or something else: Na2O, BeO2, Rb2O2, Ba(O2)2, SrO. Determine whether each oxide would be Acidic, Basic, or Amphoteric: BaO, Cl2O7, Li2O, Al2O3, SO2.
methane has a henrys law constant kof 9.88 times 10-2 mollmiddotatm when dissolved in benzene at 25degc. how many grams
A 45g piece of ice at 0 degree C is added to a sample of water at 21 degree C. All of the ice melts and the temp of water decreases to 0 degree C. How many grams of water where in the sample?
The total pressure of the mixture is 1.42 atm. What is the partial pressure of O2 in the mixture? (A) 0.211 atm (B) 0.426 atm
What is the theoretical yield of ethyl chloride in the reaction of 19.1g of ethylene with 51g of hydrogen chloride. (For ethylene: MW=28.0amu, for hydrogen chloride MW=36.5amu
Determine the acid dissociation contant for a 0.10M acetic acid solution that has a pH of 2.87. Acetic acid is weak monoprotic acid.
Explain the complete combustion of propane, C3H8(g), is represented by the equation. Explain how much heat is evolved in the complete combustion of 12.5 L C3H8 (g) at 25°C and 790 mmHg
a 14.0 g sample of iron was heated from 10.0C to 20.0C it absorbed 15.2 of energy as heat based on this data what is the specific heat of this piece of iron?
Using heat of fusion, specific heat of water, and/or heat of vaporization, calculate the amount of heat energy in each of the following. calories to condense 135 g of steam at 100^{circ}{rm C} and to cool the liquid to 15^{circ}{rm C} (two steps)
Define the effect that van der Waals forces have in folding of globular proteins. Explain what sort of structures can be affected by van der Waals forces. Explain how would proteins fold differently in a world without van derWaals forces
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