22. When an object is made of the plastic polyester (PET), it uses antimony as a

Question

22. When an object is made of the plastic polyester (PET), it uses antimony as a catalyst. After production, antimony can leach into food and drink stored in PET containers. Usually, if stored correctly for a short amount of time, the amount of antimony found in liquids is well below the safety limits. However, there have been reports of as much as 44.7 micrograms per liter [ug/L] of antimony found in fruit juice concentrates. How much antimony, in units of moles [mol], could be found in one gallon [gal] of fruit juice concentrate at this level of contamination? The molecular mass of antimony is 121.76 grams per mole [g/mol.

Explanation / Answer

per 1 Liter juice we have 44.7 micrograms of antimony

i.e per 1L juice we have 44.7 x 10^ -6 g of antimony

1 gallon has 3.785 Liters , hence per gallon antimony present = 3.785 x 44.7 x 10^ -6 g

= 0.00017g

Number of moles of antimony = mass / Molar mass of antiomony = ( 0.00017g) / ( 121.76g/mol)

= 1.4 x 10^ -6 moles

Thus number of moles of antiomoy per 1 gallon of juice = 1.4 x 10^ -6 moles

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