Which of the following concerning the effects of temperature and pressure on solubility is/are correct?
1. all gases become more soluble in a liquid at a fixed pressure when the temperature of the liquid is increased.
2. the dissolution of an ionic compound in water may be exothermic or endothermic, depending on the initial temperature of the solution.
3. the solubility of a liquid in water generally is significantly effected by pressure changes of the system.

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.