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If one ignores the thermal expansion of glass and any weighing errors due to the buoyancy effect, does the volume of water actually delivered by a volumetric pipet differ as a function of the temperature of water used in the calibration? Does the mass of the delivered water change with the temperature of the water used on the calibration?
my guess is yes to the volume vs. tempbut no to the mass vs. tempbut I feel like my logic is flawed
Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, respectively. Calculate to composition of vapor for a)C..
What is the half-life of a compound if 78 percent of a given sample of the compound decomposes in 45 min? Assume first-order kinetics.
a thermodynamic study of DyCl3 determined its standard enthalpy of formation from the following information. Determine delta (subscript f) H for DyCl3 from the following reaction enthalpies
Free radicals are important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the actions of sunlight on air pollutants, is formed in part by the following two steps.
A solution containing 29.85 mg of an unknown protein per 25.5 mL solution was found to have an osmotic pressure of 3.85 torr at 21C
Calculate the mixing ratio (ppbv) of NO2. Assume T=20 degrees Celsius = 293 K; P = Atmospheric pressure. MW of NO2 = 44g/mol.
An Erlenmeyer flask weighs 148.8 g when empty. When filled with water (d = 1.00 g/cm^3), the flask and its contents weigh 346.3 g.
The numbers indicate the relative amounts present at equilibrium, compared to 1-butene as the standard. 1-Butene: 1.0 cis-2-Butene: 7.2 Trans-2-Butene: 85 Explain this trend qualitively.
A precipitate again formed and was filtered off. Finally, the solution was treated with a sodium carbonate solution, which resulted in no precipitation. Which metal ions were definately present, which were definately absent, and which may or may n..
What are amino-acid tRNA synthetase enzymes and why are they important in the biology of cells? How many different ones do you know exist in any given cell type
A 2.85 g sample containing only MgO and CuO is placed in a 3.00 L container. The container is filled with CO2 to a pressure of 740 torr at 20 degrees C. After the reaction has gone to completion, the pressure inside the flask is 390 torr at 20 deg..
Cesium-137 has a half-life of 30 years. You begin with a 20.0 g sample of Cs-137. How many half-lives occur if you wait a total of 60 years?
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