Heats Of Combustion

This experiment was designed to evaluate the heat capacity ratios for the following gases: He, N2, CO2. There are two different methods talked about on how one would go about studying this experiment 1st is the sound velocity method and the 2nd is the adiabatic method. The adiabatic method takes into account the molecular degrees of freedom i.e. (translational, rotational, vibrational) a molecule possess. In order for us to be able to calculate some sort of reference we need to be able to calculate the theoretical heat-capacity ra

Where x = hnc/kT this is the energy spacing between vibrational states, h = plank’s constant, n = the frequency, c = speed of light, k = Boltzmann’s constant. The molar heat capacity of a molecule at a constant volume can be shown as

readings. These readings are determined as follows:

The experimental values for the heat-capacity ratios of gases are considerably lower than the theoretical values because of the following possible errors. First, to assume the process was completely adiabatic would be erroneous because as you lift the rubber septum you have to take into account the static friction created from the escaping gas molecules and the side of the glass wall. Second, there needs to be a more efficient method of determining the length of time the stopper is removed so too much of the gas is removed. Error could of also arisen from air leaks in the actual clamps and/or the rubber septum itself.

Some topics in this essay:
N2 CO2, P2 P3, Cp Cv, Experimental Method, Torr Constants, Gases Abstract, Co2 So2, heat capacity, degrees freedom, #2 #3, #1 #2, #1 #2 #3, ratios gases, n2 co2, , p1 p2 p3, gco2 =, follows gco2, gases n2 co2, gas molecules, 763 torr, follows gco2 =, heat capacity ratios,