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What is the change in entropy of 10 mol of ethylene if the gasis initially at 200oC and 800 KJ of heat is added into the system?Assume steady flow process and atmospheric pressure.
If a 58g sample of metal at 100degrees C is placed into acalorimeter containing 60 g of water at 18 degrees C, the temp ofthe water raised to 22 degrees C.
A current of 25.0 amps was maintained for 20 minutes through asolution containing excess Cu2+. How much Cu ( in grams)is plated out on the cathode?
Compare the relative reducing strengths of LiAlH4 and NaBH4. What functional groups are reduced by each?
To what two classes of compounds can primary alcohols be oxidized?What determines which product results from such an oxidation?
A mixture of 100 g of K2Cr2O7and 200 g of water is stirred at 60°C until no more of the salt dissolves.The resulting solution is poured off, leaving the undissolved solid behind.
Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351 pm, what is the radius of the copper atom?
A sample of an ideal gas at 15.0 atm and 1.0L is allowed to expand a constant external pressure of 2.00 atm at a constant temperature. Calculate the work in units of kJ for the gas expansion.
Sodium chloride, NaCl, crystallizes in a face-centered cubiclattice of chloride ions, with the smaller sodium ions occupyingholes between the chloride ions. How many Cl- ions are in contact with any
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 2.5x103m/s,the uncertainty in this position (in m) is at least (mass electron= 9.11x10-28g):
Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n= 4 to the n = 2 principal energy level.
Various members of a class of compounds, alkenes (Chapter11), react with hydrogen to produce a corresponding alkane. Termed hydrogenation, this type of reaction is used to produce products such as
Studies have shown that the concentration (in mg/cm3 of blood) of aspirin in a typical person is related to the time t (in h ) after the aspirin reaches maximum concentration by the equation ln c =
How many moles of gas are present when the pressure is 750mm Hg, the volume is 18,600 Ml, and the temperature is 25C?
Find the hydrogen-ion concentration. (If pH < 7, the solution is acid. If pH > 7, the solution is basic.) Acid rain has a pH between 4 and 5, and normal rain is slightly acidic with a pH of ab
Diamonds have successfully been prepared by submitting graphite tohigh pressure. Calculate the approximate minimum pressure needed using ΔfG=0 for graphite andΔfG=2.90 x 103 J/mol fo
To reach the equivalence point of a titration, 32.75 ml of 0.350M HCl was added to 25.0 ml of an NH3 solution of unknown concentration. what is the pH of at the equivalence point?what is the pH at t
Calculate the hydronium and hydroxide ion concentrations in the solution. Then calculate the mass of magnesim hydroxide needed to make 250ml of the solution.
Suppose you have 20.81 g of water,initially at 25.00 oC, in a perfectly insulated container. You then add water which is at 83.71 oC tothe container until the combined sample of water has a
A solution of sodium iodide containing iodine-131 was given to apatient to test for malfunctioning of the thyroid gland. What fraction of the iodine-131 nuclei would remain undecayed after9.0 d?
The amount of lactic acid,HC3H5O3, produced in a sample of muscle tissue was analyzed by reaction with hydroxide ion.Hydroxide ion was produced in the sample mixture by electrolysis.
You have to prepare a pH 4.8 buffer, and you have the following 0.10Msolution avaliblie: formic acid , sodium formate, propionic acid, sodium propionate, phosphorice acid and sodium dihydrogen phosp
Calculate the pressure exerted by 0.35 mole of oxygen gasin a volume of 6.50 L at 32oC using a) the ideal gasequation and b) the van der Waals equation.
Calculate the standard free-energy change at 25°C for the following reaction. Use standard electrode potentials.4 Al(s) + 3 O2(g)+ 12 H+(aq) → 4Al3+(aq) + 6 H2O(l)
A voltaic cell, whose cell reaction is given below, has a cellpotential of 0.72 V.2 Fe3+(aq) + Zn(s)→ 2 Fe2+(aq) +Zn2+(aq)What is the maximum electrical work that can be obtained from this cell p