Determine the change in specific internal energy for air from 350 K, 1 bar to 700 K and 2.5 bar. Determine the change in specific enthalpy of ammonia from 0.3 MPa and a quality of 0.4 to 0.3 MPa and 40oC. Determine the change in entropy for 2 kg of argon from 350 K, 1 bar to 700 K and 2.5 bar. Determine the change in specific energy for R-22 from 40oC, 16 bar, and 50 m/s to 40oC, 10 bar and 5 m/s.

the answer is 0.42 is that is an option. this question provides no info

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.