Entropy is positive as liquids have greater disorder in terms of arrangement than that of solid ( use your entropy explanation for this) the Gibbs free energy change is positive as the reaction is spontaneous
The medium that might be used to cool the hot liquid coming from a reactor is : ( C ) Heat exchanger
<h3>Function of the heat exchanger</h3>
Heat exchanger is used for the transfer of heat between liquids to be used in a chemical reaction, It can be used for both Cooling and heating to achieve the desired temperature.
The liquid coming from a reactor which posses a very high temperature will be passed through the heat exchanger so that its temperature will attain the required temperature for the experiment.
Hence we can conclude that The medium that might be used to cool the hot liquid coming from a reactor is Heat exchanger.
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Salt and water is a homogeneous mixture. Sand and water,salad dressing,soil are heterogeneous mixtures.