If 58.0 L of hydrogen is heated to 140°C and expands to 90.0 L, what was the original temperature? degree Celcius (precision to the nearest whole number)​

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0