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QUESTION

What is the percent by mass of water in barium bromide tetrahydrate ##BaBr_2 * 4H_2O##?

Approx. ##20%##

##"Mass%" = "Mass of water"/"Mass of hydrate"xx100%##

##=## ##(4xx18.0*g*mol^-1)/(369.17*g*mol^-1)xx100%=??%##

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