A student performed an experiment to determine the percent of water in a hydrate and obtained the following data. Calculate the percent of water in the hydrate. Mass of empty crucible + lid 25.88 gMass of crucible + lid + hydrate 28.45 gMass of crucible + lid + anhydrous salt (after last heating) 28.02 g

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explanation:

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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.