Asolution contains a mixture of pentane and hexane at room temperature. the solution has a vapor pressure of 256 {\rm torr}. pure pentane and hexane have vapor pressures of 425 {\rm torr} and 151 {\rm torr}, respectively, at room temperature.
what is the mole fraction of hexane? (assume ideal behavior.)

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explanation:

because it is

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.