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Explain how is the concept of effective nuclear charge used to simplify the numerous electron-electron repulsions in a many-electron atom?
Explain which experiences a greater effective nuclear charge in a Be atom, the 1s electrons or the 2s electrons?
Enter the coefficient for each compound, seperated by commas, in the order in which they appear in the equation (e.g., 1,2,3,4,5,6,7).
Explain why is the reaction of alkenes with HCl not a useful as a characterization reaction however reaction with Br2 is a good characterization reaction
Ethanol (C2H5OH) has a normal boiling point of 78.3 celsium and with DeltaHvap=39.3KJ/mol. What is the vapor pressure of ethanol at 50.0 celsium
A solution is prepared by mixing 87.0 mL of 5.00 M HCl and 36.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Calculate [H+ ], [OH - ], and the pH for this solution.
Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules. Several other gases make up the remaining 1% of air molecules. What is the partial pressure of nitrogen in air at atmospheric pressure (1 atm)
An expanding gas does 175.0 J of work on its surroundings at a constant pressure of 1.0 atm. If the gas initially occupied 68.0 mL, what is the final volume of the gas
For the reaction SO3+H2O yields H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid?
When 18.5 mL of propanoic acid and 19.0 mL of n-propanol are mixed together, calculate the volume of water expected if the yield of the ester were 100%
Calculate the heat of solution, DeltaH_soln, of KCl. Assume that the specific heat of the solution is identical to that of water, 4.18 J/(g/C).kj/mol
Assume that you are an experienced organic chemist with perfect recrystallization technique. You recrystallize 10g of impure naphthalene from Ethanol in Corvallis, OR (elevation; sea level) and recover 7.4g of pure naphthalene.
Nitrate compounds are insoluble and form precipitates. Most carbonate compounds form precipitates due to their low solubilities. Group IA elements form compounds that are precipitates.
Given that the standard enthalpy of formation of atomic hydrogen, H(g), is -219.0 kJ/mol, find the standard reaction enthalpy for the reaction H2(g) -> 2H(g) (calculate result in kJ/mol and give the numerical value)
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