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In a hydrogen atom, the 2s and the 2p orbitals have the same energy. In a nitrogen atom, the energies of 2s and the 2p orbitals are different. Explane why.
If a chalice made of pure gold weighing 0.6 kg and initially at 25 C is filled with 150.0 mL of water at 83 C, what is the final equilibrium temperature of the system? The heat capacities of water a
A sample of liquid mercury (mass 57 g and temperature 181.0 C) is poured into 80 g of H2O at 15 C. Calculate the final temperature of the mixture, assuming no heat is lost. The heat capacities of Hg a
Given that mercury has a delta Hvap of 59.11 kJ/mol and its normal boiling point is 356.7 degrees C, calculate the vapor pressure in mm Hg at room temperature, 25 degrees Celcius.
When sulfur trioxide gas reacts with water, a solution of sulfuric acid forms. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
A 2.91 Liter flask at 17 degrees celsius contains a mixture of N2, He and Ne at partial pressures of 0.253 atm for N2, 0.155 atm for He and 0.477 atm for Ne. Calculate the volume in liters at STP occu
Draw the major Diels-Alder product formed in the given reaction. All hydrogen atoms are implied. If a chiral carbon atom is attached to a hydrogen atom.
A sample 50 mL solution of hydrochloric acid (HCl) is titrated with 0.11 M NaOH. The volume of base required to reach the equivalence point is measured to be 33.772 mL. What was the original concent
If Delta H = -80.0 kJ and Delta S = -0.300 kJ/K, the reaction is spontaneous below a certain temperature. Calculate that temperature.
Calculate the mass of HCl that is neutralized by 2 g of Mg(OH)2(s)
For the first irder reaction 2N2O5 --> 2N2 O4 + O2 at a particular temperature, the half - life of N2O5 is 0.90 hr . What fraction of the initial concentration of N2O5 will remain after 2.4 hour
Calculate the concentration of a solution prepared by adding enough water to 2.2 g of sucrose (C12H22O11) to make a total of 50 mL of solution.
If 1.4 M H2SO4 is used to titrate a 300.0 mL solution of 1.76 M ammonia (NH3), what volume of acid is required to completely neutralize the base? Each mole of this strong diprotic acid produces two
An atom has an electron with energy -9.00E-19 J. It absorbs a photon and moves to a new level with energy -4.00E-19 J. What is the wavelength of the photon in nm?
A dilute solution of benzoic acid, C6H5COOH, is prepared by adding 7 mL of 1.85 M benzoic acid to a volumetric flask and adding enough water to bring the total volume of solution to 250 mL. What is
Consider a 0.05-mm thick, 500 mm2 piece of aluminum foil. How many unit cells exist in the foil? Calculate the mass of each unit cell using density of aluminum of 2.71 g/cm3.
A compound having an approximate molar mass of 120-15 g has the following percent composition by mass: carbon, 38.44%; hydrogen, 4.839%; chlorine, 56.73%. Determine the empirical and molecular form
How many energy levels are present in the 3s conduction band of a single crystal of sodium weighing 26.8 mg? How many electrons are present in this band?
If a 1.201 g sample of aluminum metal is heated in a chlorine gas atmosphere, the mass of aluminum chloride produced is 5.934 g. Calculate the empirical formula of aluminum chloride.
RATE = k [A] [B]2 [C]-1 , indicate the order with respect to each species and the overall order. Then calculate the total factor by which the rate would increase if each reactant's concent
Consider the following reaction and associated equilibrium constant:
If the rate of disappearance of ozone is -7.2 x 10^-4 M/s, what is the rate of formation of oxygen? Please show all work and explanations.
A certain second-order reaction (B---products) has a rate constant of 1.00×10-3 M-1*s-1 at 27 C and an initial half-life of 294 s. What is the concentration of the reactant B after one half-l
Concentrated sodium hydroxide is 19.4 M and 50.5% NaOH by mass. What is the density of the concentrated NaOH? Please show all work and explanations.
What is the effect of a temperature change on a chemical reaction initially at equilibrium? How does the effect differ for an exothermic reaction compared to an endothermic one?