The vapor pressure of a substance at 30 C is 70 kPa and its enthalpy of vaporization is 20 kJ / mol Estimate the temperature (in K ) at which its vapor pressure is 90 kPa​

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.