Advanced Study Assignment in Lab Manual Gen Chem 1
The barometric pressure on a winter day in Minnesota was found to be 747 mm Hg. What would the pressure be in cm H_2O? How many meters of water would it take to exert that pressure? In this experiment a student found that when she increased the temperature of a 550 mL sample of air from 22.3 degree C to 29.7 degree C, the pressure of the air went from 1009 cm H_2O up to 1033 cm H_2O. Since the air expands linearly with temperature, the equation relating P to t is of the form: P = mt + b where m is the slope of the line and b is a constant. What is the slope of the line? Find the change in P divided by the change in t.) m = _____ Find the value of b. (Substitute known values of P and t into Equation 9 and solve for h.) b =_____ Express Equation 9 in terms of the values of m and b. P = _____ At what temperature t will P become zero? The temperature in part d is the absolute zero of temperature. Lord Kelvin suggested that we set up a scale on which that temperature is 0 K. On the scale, T = t + A. Show that, on Kelvin scale, your equation reduces to P = mT.