Pentane (C5H12) and hexane (C6H14) form an ideal solution. At 25ºC the vapor pressures of pentane and hexane are 511 and 150.torr, respectively. A solution is prepared by mixing 25 mL pentane (density=0.63 g/mL) with 45 mL hexane (density=0.66 g/mL).a) What is the vapor pressure of the resulting solution?b) What is the composition by mole fraction of pentane in the vapor that is in equilibrium with this solution?

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.