Practice Problem #$2$

Consider a privately owned retail business that sells metal accessories. The business receives approximately $250$ Ibs of new merchandise every day. Since much of the merchandise sold must be matched to an old sample for verification, most customers bring their old merchandise into the store. A number of customers leave their old is brts behind to be disposed by the business. It is estimated that about $20$ percent of the total amount of metal sold Of the amount of total merch.

Of the amount of total merchandise received, approximately $9$ percent of the weight is in packaging percent is recycled after the merchandise is unpacked. A the packaging material is cardboard, of which $60$ cardboard is sold with merchandise over the counter. The remaining paper and cardboard is disposed by in the dumpster.

The remaining weight of merchandise is metal parts and chemicals. Chemicals make up $11$ percent of the total and all but $10$ percent are sold daily. The remaining $10$ percent is used within the business for cleaning equipment and is disposed of as hazardous waste. Seventy$-$eight percent of the metal parts are sold per day with the remainder stored internally. Perform a mass balance and a flow diagram.

Consider a privately

Ibs of new merchandised retail business that sells metal accessories. The business receives approximately $250$ verification, most customers bring their much of the merchandise sold must be matched to an old sample for is brought in and left by custod the business. It is estimated that about $20$ percent of the total amount of metal sold Of the amount of total merchat

material $($paper and cardboard$).$ Eighty percent is recycled after the merchandise is unpercent of the packaging material is cardboard, of which $60$ cardboard is sold with merchandise over the counter. The remaining paper and cardboard is disposed by in the dumpster. The total and all but $10$ percent merchandise is metal parts and chemicals. Chemicals make up $11$ percent of the equipment and is percent are sold daily. The remaining $10$ percent is used within the business for cleaning the remainder stored internally. Perform a mass balance and a flow diagram.

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$(3)$ Matierial Mass Balance Aralysis

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