The 50:50 mixture of aspirin (Lit. MP: 135-136 oC) and 4-bromobenzoic acid (Lit. MP: 252-254 oC) will have the melting point in the range of:.

193.5-195 °C.

Explanation:

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In this case, since the mixture is 50:50, we can infer that an average may be used to compute the required range; thus, we first compute the the inner limit by using 135 °C and 252 °C:

And the upper limit:

Thus, the average melting point would be around 193.5-195 °C.

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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.