Archive for the ‘Chemistry’ Category
Tuesday, November 3rd, 2009
khuezi asked: The molar enthalpy of vaporization of water at 373 K is 41.16 kJ/mol. What fraction of this energy is used to change the internal energy of the water? (Assume that water vapor is an ideal gas.)
What fraction is used to do work against the atmosphere?
What equation do I ...
Posted in Chemistry | 1 Comment »
Tuesday, October 27th, 2009
Brian H asked: I am confused between standard gibbs free energy change and gibbs free energy change. Aren't both the change in gibbs free energy of the system when reactants are converted completely, or 100 %, to products? Why does the change in gibbs free energy of the reaction change ...
Posted in Chemistry | 1 Comment »
Tuesday, October 13th, 2009
Ben and Jerry's asked: How many of the following happens?
The kinetic energy is transferred to the air.
The kinetic energy is transferred to the sand.
Its speed drops to zero.
Its speed increases.
Energy is consumed.
Energy is released.
The ball expands due to heat increase.
The ball is deformedCARMEN
Posted in Chemistry | 2 Comments »
Thursday, September 3rd, 2009
Brian L asked: This is for extracting various alcohols and water from a solution without having to maintain the solution at a very high temperature. I think it might be less energy intensive this way, but I have no data on energy needed to maintain a vaccum. What ...
Posted in Chemistry | 3 Comments »
Wednesday, September 2nd, 2009
Luv2singnbling asked: How much energy as heat must be transferred to raise the temperature of a 55 g sample of aluminum foil from?
How much energy as heat must be transferred to raise the temperature of a 55 g sample of aluminum foil from?
How much energy as heat must be transferred ...
Posted in Chemistry | 1 Comment »