The lennard-jones potential is widely-used to describe van der waals interactions. it has the form: v(r) = 4e s r 12 s r 6 where s and e are constants that vary with the atoms involved. s has units of length, and e has units of energy. (a) differentiate this and set the derivative to zero in order to find the equilibrium bond length and bond energy in terms of s and e. (b) for interactions between argon atoms, e = 1: j, and s = 0: 3345 nm. in solid argon, each atom interacts with 12 nearest neighbors at the equilibrium bond distance. use this information to estimate the total cohesive (that is, bonding) energy in 1 mole of solid argon.

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?