a. When two different liquids are mixed or when a gas or solid is dissolved in a liquid, bonds are broken between neighbouring molecules (or sometimes atom) in the feed materials, and new bonds are formed between neighbouring molecules (or ions) in the product solution. . Briefly distinguish between heat of solutions and standard heat of formation of solution. (3 marks) ii. Consider solid X is to be dissolved in solvent Y. If A; is the heat of formation of X(s), using the appropriate notations, write an equation to calculate the standard heat of formation of solution that contains 5 mol of Xin 100 mol of Y at 25C, relative to X and Y. (4 marks)