In the sapling prelab for this experiment you used spartan to calculate the enthalpy of formation (δhf) of the hydrogen bond between two ethanol molecules. compare that value with the enthalpy of vaporization (δhvap) you found experimentally for ethanol. the magnitudes of the two values should be close, but the sign is opposite. why? what are the values and how are they related?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.