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What is the main purpose of scratching beaker's wall during the synthesis of the complex?
What is the volume of the Hope Diamond, the world's largest blue diamond at 44.4 carats? (1 carat = 200 mg). How many carbon atoms does it contain?
There are side reactions. These plus losses of product during its purification reduce the overall yield. A typical yield of purified adipic acid is 68.6%.
What is the chemical formula for potassium tetrabromo(ortho-phenanthroline)-cobaltate(III)
Calculate the mass ( kg ) of the solute C4H8O and the volume ( mL ) of the solvent C6H6 that should be combined to generate 6450 g of a solution that is 2.07 m C4H8O.
A solution containing 16.9 g of nonvolatile molecular compound in 250. g of water has a freezing point of -0.744°C. What is the molar mass of the substance?
Calculate the theoretical yield of AlF3, obtained from 0.35 mole of Al in the reaction:
Cobalt-60, which undergoes beta decay, has a half life of 5.26 years. How many beta particles are emitted in 160 s by a 3.95 mg sample of 60Co?
Magnesium metal reacts quantitatively with oxygen to give magnesium oxide, MgO. If 5.00 g of Mg and 5.00 g of O2 are allowed to react, what weight of MgO is formed, and what weight of which reactan
Dimethylhydrazine, (CH3)2NNH2, was used as a fuel for the Apollo Lunar Descent Module, with N2O4 being used as the oxidant. The products of the reaction are H2O, N2, and CO2. i) Write a balanced che
At 25ºC the solubility product constant, Ksp, for strontium sulfate, SrSO4, is 7.6´10-7. What is the molar solubility of SrSO4 in pure water at 25ºC?
Aluminum dissolves in an aqueous solution of NaOH according to the following reaction: Which is the limiting reagent?
Explain the difference (or similarity) in conductivity of: K2C2O4 and CaCl2. Do the same thing for H2C2O4 and HCl
Polar molecules are responsible for the absorption of mircowave energy by food items. Draw the Louis structure for each of the following substances, state which ones will absorb microwaves and why.
By titration, 23.4 mL of aqueous H2SO4 neutralized 24.8 mL of 0.0495 M LiOH solution. What was the molarity of the aqueous acid solution?
A 460 mL sample of oxygen (O2) was collected by displacement of water at 24 ? C under a total barometric pressure of 1095 torr. What mass of dry oxygen was collected? The vapor pressure of water at
If the yield of potassium benzoate cannot realistically be expected to be more than 68%, what is the minimum number of grams of toluene needed to achieve this yield while producing 10.0 g of KC7H5O2
Potassium carbonate was added to the water to prevent freezing during cold weather. If the solution is 40.0% K2CO3 by mass, what is the "ideal" freezing point of this solution in Celsius?
What is the function of the BaSO4 solution as a traditional method of measuring a knife wound in a homicide victim's body? Describe a medical application for BaSO4
Describe a procedure by which you would prepare 250 cubic centimeter of aqueous sulphamic acid of accurately known concentration.
Rhodium has a density of 12.45 g/cm3. This metal crystallizes in a face-centered cubic unit cell. Calculate the diameter of a rhodium atom?
A research supervisor told a chemist to make 100 g of chlorobenzene from the reaction of benzene with chlorine and to expect a yield no higher that 65%. What is the minimum quantity of benzene that
Certain metals can be extracted from their salts (usually halides: those containing Group 17 elements such as chlorine, fluorine, bromine or iodine) by the process of electrolysis.
The vapor pressure of an unknown compound at 25 degrees C is 94.6 Torr and its enthalpy of vaporization is 30811 J/mol. Estimate the normal boiling point of this compound. assume the enthalpy of vap
A 10.9 mol sample of argon gas is maintained in a 0.787 L container at 298 K. What is the pressure in atm calculated using the van der Waals' equation for Ar gas under these conditions? For Ar, a =