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Heat capacity equation using a string command
Posted:
Feb 23, 2014 2:26 PM


The temperature dependence of the heat capacity Cp of many gasses can be described in terms of a cubic equation : Cp=a+bT+cT^2+dT^4 Gas a b c d
SO2 38.91 3.904x10^2 3.105x10^5 8.606x10^9 SO3 48.5 9.188x10^2 8.540x10^5 32.4x10^9 O2 29.10 1.158x10^2 .6076x10^5 1.311x 10^9 N2 29 .00 2199x10^2 .5723x10^5 2.871 x 10^9
Write a function that does the following: Requires user to enter the gas name as a string and the temperature as a number. If a temperature below 20C or above 300C is entered, have the function display a message that reads, "Temperature entered is outside the range. Temp must be between 20 and 300 deg C.' If the string for the gas is intered incorrectly or a gas that isn't listed in the table is entered, have the function display the following: "No data matches the gas you entered." When the temperature is given within the proper temperature range, calculate Cp for the correct gas using the polyval() command discussed in class. If the Cp is calculated, the output should be displayed as: "The Heat Capacity for (gas name) is (calculated heat capacity in J/(gmole*degC)."



