Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at −14.5 ∘c? the freezing point for pure water is 0.0 ∘c and kf is equal to 1.86 ∘c/m answer=109 g part b needed: if the 3.90 m solution from part a boils at 103.45 ∘c, what is the actual value of the van't hoff factor, i? the boiling point of pure water is 100.00 ∘c and kb is equal to 0.512 ∘c/m.

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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.