Initially, 10 kg of r-134a is contained in a piston-cylinder system at 200 kpa as a saturated vapor. an 8 minute process occurs where 200 kj of heat is transferred to the refrigerant at constant pressure while a 110 volt electrical source supplies current to a resistor within the cylinder. at the end of the process, the temperature of the refrigerant is 60°c. show the process on a t-v diagram with respect to the saturation lines.

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?