6.52 The molar enthalpy of a binary liquid mixture of species 1 and 2 is given by: h = x1 (275 + 75T) + x2(125 + 50T) + 750x1x2[J / mol]

where T is the temperature in [K]

(a) What is the enthalpy of mixing, \DeltaHmix in [J], of a mixture with 2 mol of 1 and 3 mol of 2 at 20°C?

(b) Consider the adiabatic mixing of a stream of pure 1 flowing at 2 mol/s with a stream of pure 2 flowing at 3 mol/s. Both inlet streams are at 20°C. What is the exit temperature of the mixture?

Koretsky, Milo D.. Engineering and Chemical Thermodynamics, 2nd Edition (Page 384). Wiley Higher Ed. Kindle Edition.

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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.