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To effuse from a hole in a chamber a given volume of nitrogen needed the 68.3 seconds. Under the same conditions, another gas needed 85.6 seconds for the same volume to effuse. How can estimate the
Determine the numbers of oxide ions surround each Mg2 + ion as nearest neighbors? MgO has the same cyrstal structure as NaCl, face-centered cubic.
Determine the numbers of moles of Al2(SO4)3 can produce under these conditions mol. Determine the numbers of moles of the excess reactant remain after the completion of the reaction?
Determine the van's Hoff factor for the electrolyte. A dilute electrolyte solution is prepared by dissolving the iron (III)chloride in the water. It is found to have a freezing point of-2.90 C. Cal
Determine the numbers of energy is needed to vaporize the 125g of benzene, C6H6, at its boiling point, 80.1 degrees C? where the heat of vaporization of benzene is 30.8 kJ/mol
Calculate the mass of potassium oxide formed when the 3.40 g potassium react with excess oxygen when the potassium metal reacts with the oxygen gas to give potassium oxide.
Calculate the mass of oxygen needed to react with the 1.60 g potassium when the potassium metal reacts with oxygen gas to give potassium oxide. Atomic masses in g mol-1 of K = 39.10 and O =16
Determine the volume of 0.5000M EDTA required to titrate the Ca2+ in a 0.5140g mineral specimen that is 81.4% brushite,CaHPO4*H2O (MW: 172.09 g/mol).
Calculate the rate of transfer of heat by conduction from the warm sheet (50 C) to the cold sheet (-10 C)? Determine the rate of loss of heat when the two sheets of copper of area 1.50 m2 are
Determine what minimum mass of H2So4 (in g) would you require? What mass of H2 gas (in g) would be formed by the complete reaction of the aluminum block?
Calculate the probability that the particle will be found with a linear momentum when a particle is in a state described by the wave function , where the χ is a parameter.
Find out the specific rotation? Determine the specific rotation if the same solution is placed in a 5 cm tube? A solution is added to a 20 cm polar meter tube. 3.2g of solute is dissolve
Calculate the bonding geometry around the nitrogen atom in the following unstable nitrogen oxides. (N2O2 and N2O3have N-N bonds; N2O5 does not)
If the activity of carbon-14 decay in an equal mass of living matter is 33.6 disintegrations per second, determine the age of the charcoal? The activity of radioactive carbon-14 decay of a piece of
Determine the half-life of 90Y. A freshly isolated sample of 90Y was found to have an activity of 9.7 x 105 disintegrations per minute at the 1:00 P.M. on December 3, 200
Determine the numbers of grams of dry NH4Cl required to be added to 2.50 L of a 0.700 M solution of ammonia, NH3, to prepare a buffer solution that has a PH of 8.81? Kb for ammonia is 1.8x10^-5.
What would you expect to happen to the absorbance reading if one does not wipe their fingerprint off from a curette before measuring the absorbance in a spec to photometer.
Suppose you conclude that the reaction order n=0 for a reaction with t half-life at 10 min, 20 min, and 40 min, because half-life is dependent on the concentration. But why can't the reaction be sec
Illustrate the probability envelopes for each of the 3d-orbitals. Make sure that you indicate the positions of the axes(x, y & z) and the sign of the wave function for each portion on t
Determine the numbers of grams of NaCH3COO must be added to 150.0 mL of a .150 M solution of CH3COOH to produce a buffer of pH4.75? Suppose that the volume will remain constant, pK A forCH3COOH = 4.75
Determine the ratio of ethyl a mine(CH3CH2NH2) to the ethyl ammonium ion (CH3CH2NH3+) in a solution with a pH of 11.0 pKa forCH3CH2NH3+ =10.636
Suppose one begins with 55.0 g of arsenic trioxide dissolved in water, and repeatedly dilutes the solution with pure water, each dilution reducing the amount of arsenic trioxide in the solution by a
Determine the percentage of K2O (94.20g/mole) in a fertilizer when a 0.4320 g sample gives 0.2138 g ofKB(C6H5)4 (358.2 g/mol). MM K =39.1 g/mole. Sodium tetraphenylborate, NaB(C6H5)4 is used as a