When a liquid in a closed container reaches a state of equilibrium with its vapor,
a. the number of molecules in the vapor state and the liquid state are equal
b. the number of molecules evaporating and condensing are equal

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

How does a hydroelectric power plant converts energy into energy.

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.