please help with both questions if possible! DIRECTIONS: Please complete the fol

Question

please help with both questions if possible!

DIRECTIONS: Please complete the following questions on separate paper and staple them to this sheet Turn in your work at the beginning of class on the assigned day. Follow the guidelines for take home assignments. Good luck! In assignment 1, you found the volume of 1 mole nitrogen at 1 atm and 1 K according to the ideal gas law and the van der Waals equation. 1. Do the ideal gas and van der Waals equation results agree? b. a. Why are they different? How would these compare to the experimental value? d. c. Would agreement be the same, better or worse if the temperature were increased to 400 K? 2. For each of the following processes, define the system and surroundings, identify each energy change as primarily heat or work, and determine whether the sign of AE is positive or negative for the system. a. Sweat evaporates from the skin, cooling the skin. b. A balloon expands against an external pressure. c. An aqueous chemical reaction mixture is warmed with an external flame. d. Engines increase the speed of a jet. e. A furnace heats a home. f. You help a friend move a couch. A platinum ring is dropped in a pool of water and c temperature of the platinum ring (mass 3. ools to equilibrium. Determine the initial 366. g) if the ring has a final temperature of 12.0°C and

Explanation / Answer

1.a) The ideal gas equation and van der waal gas equation do not agree as they give different results for volume for the same condition.

1.b) The difference arises because in ideal gas law we assume that the gas is ideal, that is, it neither has any intermolecular forces of interaction, nor any interaction between the wall of container and the gas particles, and the particles don't occupy any volume. But in van der waal equation, we account for the volume of qccupied by the particles as b, and the measure of attraction between particles as a. So there arises a difference between the results.

1.c) The experimental value for van der waal equation will be less than that of ideal gas equation. At low pressure, van der waal equation modifies to (P+a/V2)V=RT. So the result is the solution of a quadratic equation. Thus it is less than the ideal gas solution.

1.d) At very high temperatures, the van der waal's equation is modified as P(V-nb)=RT. As the volume occupied by the gas particles is extremely less than the volume occupied by the gas at high temperature, the gas tends to follow the ideal gas equation. Thus both the equation will give the same result for the volume calculation.

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