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The enthalpy of vaporization of chloroform (CHCl3) is 29.4 kJ mol-1 at its normal boiling point of 334.88 K. Calculate (a) the entropy of vaporization of chloroform at this temperature and (b) the
Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 .
Compound A (C6H14) gives three different monochlorides on photochemical chlorination. One of these monochlorides is inert to E2 elimination. The other two monochlorides yield the same alkene B (C6H
Predict the product, if any, of reaction between propanoyl chloride and the following reagents:
What conditions must be present for (a) translational equilibrium and (b) rotational equilibrium of a rigid body? If these conditions for equilibrium are satisfied, is the rigid body necessarily in st
Silver iodide, Agl, is less soluble in aqueous ammonia than either AgBr or AgCl. What two factors could contribute to this result? Explain.
Find the vertices of the image of ΔABC under the translation T-2,5. To what complex number does this correspond?
Explain the dissolution of silver chloride in aqueous ammonia and its reprecipitation in terms of ionic equilibria and solubility product.
Explain the fundamental difference between singlet and triplet state. From this fundamental difference explain why phosphorescence takes at least 100,000 times more to occur than fluorescence.
Explain, with the help of a suitable clearly-labeled diagram, the difference between molecular fluorescence and phosphorescence. Your explanation should include discussion of the time frames involv
A 0.450-kg ice puck, moving east with a speed of 3.00m/s, has a head-on collision with a 0.900-kg puck initially at rest. Assuming a perfectly elastic collision, what will be the speed direction of
Using the proposed solution for u, find the acceleration a. Find the distance the raindrop has fallen in t = 3.00 s.
What are the differences between esterification and neutralisation?
Propylene oxide is a chiral molecule. Hydrolysis of propylene oxide gives propylene glycol, another chiral molecule. Draw the enantiomers of propylene oxide.
The atomic spacing in rock salt, NaCl, is 0.282 nm. Find the kinetic energy (in eV) of a neutron with a de Broglie wavelength of 0.282 nm. Is a relativistic calculation needed? Such neutrons can be
A spherical interplanetary probe of 0.5-m diameter contains electronics that dissipate 150 W. If the probe surface has an emissivity of 0.8 and the probe does not receive radiation from other surfa
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that
There are two different ways to look at this problem, each of which will give us the same answer. Let's look at each separately. (For all of the questions below, let's start by defining the potentia
Common salt, NaCI, has a density of 2.165 g/cm3. The molecular weight of NaCI is 58.44. Estimate the distance between nearest neighbor Na and CI ions.
Write a net ionic equation for the reaction between aqueous solutions of ammonia and hydrofluoric acid.
Write a net ionic equation for the reaction between aqueous solutions of perchloric acid and rubidium hydroxide.
We want to prepare a buffer of pH 8.5643 by adding HCN and NaCN to 1.860 L of solution. What is the ratio of HCN to NaCN (both given in moles) necessary to obtain the desired pH? [Note: Ka(HCN) = 4
The masses and volume of two cylinders are measured. The mass of cylinder 1 is 1.35 times the mass of cylinder 2. The volume of cylinder 1 is 0.792 times the volume of cylinder 2. If the density of
When the following reaction is balanced in acid solution using the lowest possible whole number coefficients, the coefficient of H+(aq) will be:
When the following equation is balanced using the smallest possible integers, what is the exponent of N2O in the reaction quotient expression?