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When solving this problem, assume that no heat is lost from the calorimeter to the surroundings, the density of all solutions is 1.00 g/mL, the specific heat of all solutions is the same as that of
How much energy is evolved during the reaction of 32.5 g B2H6 and 72.5 g Cl2? Given: B2H6(g) +6Cl2 (g)---->2BCl3 (g) + 6HCl (g) DH -1396kj
The pyrene excimer emission spectrum at a (higher/lower/same) wavelength than (as) the excited pyrene fluorescence emission spectrum. Explain.
A solution is made by dissolving 25.7 g of NaOH in approximately 450 mL of water in a volumetric flask. The solution becomes quite warm, but after it is allowed to return to room temperature, water
The half-life of methylmercury in the human body is estimated to be close to 100 days. Suppose a person weighing 65 kg eats 0.5 kg of fish containing 0.5
Which factors affect the position or exact frequency of vibration-rotation transitions. a. pressure
Phenol (C6H5OH, also called carbolic acid) has a pKa of 9.89. It is used to preserve body tissues and is quite toxic. Calculate the percent ionized in 0.0503 M phenol--a dilute solution.
An oxyacetylene flame is often used in the welding of metals. Estimate the flame temperature produced by the reaction. 2C2H2(g) + 5O2(g) --> 4CO2(g) + 2H2O(g)
An atom of element number 33 (As) is in its ground electronic state. Which one of the following sets of quantum numbers could not apply to any of its electrons
The convention of arbitrarily assigning a zero enthalpy value to all the most stable elements in the standards state and (usually) 298 K is a convenient way of dealing with the enthalpy changes of c
Calculate %wt of C, H, and O in the compound and find the empirical formula of this compound - What is the weight percent of Cl
Calculate the ?(wavelength) (m) associated with an electron that travels at 50% of the speed of light. (Mass of an electron = 9.11 × 10-28 g)
Explain why the boiling point of your cyclohexane: toluene mixture rose slowly throughout your simple distillation procedure. Explain this in terms of the temerature/composition diagram
Predict the change in energy (J/photon) that occurs when an electron moves from n = 2 to n = 1.
A 0.00100 mol sample of Ca(OH)2 requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl
A certain wavelength is 1100 nm. What is the energy for a mol of photons (J/mol) with this wavelength
A 1.585 L container of F2 at 750.0 mm Hg was connected to another evacuated container which had a volume of 1.988 L and separated by a valve. What was the final pressure in atmospheres if the valve
What is the molar ratio of initiator (2-methylpropionitrile) MW: 164.21 to sulfuryl chloride MW: 134.97 in the procedure? Why is so little initiator needed relative to the amount of chlorinating age
Assume that the relative yield of the products in your experiment will be proportional only to the numbers of hydrogens that give each product when substituted for by chlorine.
Give a set of four quantum numbers that correspond to an electron in the highest occupied atomic orbital of Indium.
Draw the structure resulting from a reaction of osmium tetroxide (OsO4) and hydrogen peroxide (H2O2) with the following alkene.
If a mixture of heptane (bp = 98C) and octane (bp=126C) is places in a gas chromatography machine, at what temperature should the oven be set
What is the molar ratio of initiator to sulfuryl chloride in the procedure? Why is so little initiator needed relative to the amount of chlorinating agent used
The rate constant of a first-order reaction 7.60 *10^-4 s^-1 at 350 degree celcius. If the activation energy is 134 KJ/mol, what is the temperature at which its rate constant is 9.70 *10^-4 s^-1
For the following reaction KClO3---->KCl+1/2 O2 assign oxidation states to each element on each side of the equation. reactants and products. Which element is oxidized? Which element is reduced