how many moles of KBr will be produced from 7 moles of BaBr2? BaBr2+K2SO4-KBr+BaSO4

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It's a simple coefficient problem. Once we balance the equation we get BaBr2 + K2SO4 --> 2KBr + BaSO4We will get twice the number of moles of KBr when reacting BaBr2, so if we use 7 moles, we will get 14 moles of KBr.