3. Write down the equation expression Ideal-gas Law 4. The apparatus in your lab

Question

3. Write down the equation expression Ideal-gas Law 4. The apparatus in your lab consists of a pressure gauge connected to a metal cylinder of constant volume. The cylinder is immersed in water bath that has different temperatures. The gas pressure changes with the temperature as shown in the table below. TOC), t l °C 27 130 230 300 P(N/m2), ± 0.05×105 N/m? 1.0× 105 1.3 x 105 1.7 x 10 1.9 x 105 a) How does the gas pressure change as the temperature changes? Make sure that you plot the graph to find the dependence. b) Find the slope and y-intercept of the dependence if it is linear. c) Use the values to find at which temperature the pressure is equal to zero. You can do it by two methods: Graphically, by extending the trendline (open the trendline options, select Forecast, Backward and type the number of "periods", about 300). Algebraically, by solving equation P kT+b, where k and b are the slope and y-intercept of the dependence, and P is equal to zero.

Explanation / Answer

3)

The volume (V) occupied by n moles of any gas has a pressure (P) at temperature (T) in Kelvin. The relationship for these variables,

P V = n R T,

where R is known as the gas constant, is called the ideal gas law.

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