Question
ONLY NEED PARTS F & G, I'm giving all of it because it might help solve for them.
This problem investigates the amount of work done per stroke of a 4-cylinder 2.0 L engine. The volume of each cylinder is 0.5 L and the end of the piston stroke (i.e. this is the final volume). Assume that the initial volume (i.e. when the piston is at the top of the cylinder) is 0.03 L. The temperature is 500 K at the instant that the fuel is combusted and the initial pressure is 1085 atm.
REMINDER: Pay attention to the sign convention.
A.How many moles of gas are in the cylinder following combustion?
This problem investigates the amount of work done per stroke of a 4-cylinder 2.0 L engine. The volume of each cylinder is 0.5 L and the end of the piston stroke (i.e. this is the final volume). Assume that the initial volume (i.e. when the piston is at the top of the cylinder) is 0.03 L. The temperature is 500 K at the instant that the fuel is combusted and the initial pressure is 1085 atm. How many moles of gas are in the cylinder following combustion? Calculate the work if the engine is perfectly reversible. Calculate the heat transferred if the engine is perfectly reversible. If the engine is not reversible gas in the cylinder could expand in a sudden jump against a constant pressure of 65.1 atm. What is the work in this case? REMINDER: Convert from L-atm to Joules. If the pressure has the value 65.1, then the gas in the cylinder would cool from its original value according to the ideal gas law. What is the temperature following cooling at constant volume? HINT: Picture the three paths (const. T, V and P) on a pressure-volume plot. We can all agree that the temperature is not very realistic. It is hard to make a perfect engine, but it may also be hard to make an engine is imperfect as the single-step engine. Nonetheless, we can calculate the internal energy change for the constant volume step assuming that the gas is a polyatomic gas with a molar heat capacity of 3R. Using all of these values calculate the enthalpy change for the constant pressure expansion.
Explanation / Answer
