5 - Find the number of moles. A physicist performs an experiment to evaluate the number of moles of a gas inside a container. The container is kept at constant room temperature of 23 C and is built in such a way that the number of moles stays constant. The physicist changes the volume to different values and measures the corresponding absolute pressures. The table below shows the results of the experiment. V 50 ml 45 ml 40 ml 35 ml 30 ml 25 ml P 168 kPa 194 kPa 215 kPa 248 kPa 287 kPa 377 kPa Make a plot of P vs 1/V, force the intercept to zero and calculate the slope of the line. If you plot P vs V the plot is not linear. 25. Value of the slope = Assuming the gas obeys the ideal gas law, use the value of the slope to find the number of moles. Pay attention to using the correct units for all the quantities. For example the gas constant R has the value 8.314 if V is expressed in m3, P in Pascal and T in degrees Kelvin. 26. Number of moles n =