Section Date Pre-Lab Questions 3. List two assumptions of the kinetic molecular

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Section Date Pre-Lab Questions 3. List two assumptions of the kinetic molecular theory cited in this lab exercise, and how they are relevant to the estimation of absolute zero 4. A student performed this experiment and collected the following data: Vigh at Thigh ( 1000°C)-262 mL Vlow at Thow (22.4 °C) 201 mL Plot volume on the ordinate (y-axis) vs temperature on the abscissa (x-axis) in Excel. Add a line connecting the points, and extrapolate this line to where it intersects the x- axis. a) Calculate the percent error between the experimentally determined value of Y and the accepted value of absolute zero,-273°C. b) % error- Extrapolation using more than two data points can decrease the error in the estimated value. How could you modify the procedure to obtain a reliable third data point, i.e., volume at a third temperature? 3.

Explanation / Answer

3.

Assumptions of Kinetic Molecular Theory:

(i) According to Kinetic Molecular Theory, molecules have no kinetic energy at absolute zero

(ii) collisions between gas particles and their container walls are elastic collisions

(iii)The average velocity of the particles is proportional to the temperature of the gas

(iv)Gas molecules do not react.

Absolute zero is defined as the point where no more heat can be removed from a system, according to the absolute or thermodynamic temperature scale. This corresponds to 0 K or -273.15°C. If the molecules have no kinetic energy, they have no translational motion.However, according to quantum mechanics, all particles have a zero-point energy, even at absolute zero.

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