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# Suppose you are hired to haul away the waste left over from place that develops film. It turns out the waste actually contains lor of silver nitrate' You deci...

## Question

###### Suppose you are hired to haul away the waste left over from place that develops film. It turns out the waste actually contains lor of silver nitrate' You decide you will treat the waste with copper metal in order to recover the silver and cash in. The relevant equation is: AgNO; Cu Cu(NO;)1 2 Ag 169.89 glmol 63.55 glmol A stoichiometric calculation you need to work through for this type of scheme involves relat- ing how much copper it takes t0 react with a given amount of the silver nitrat

Suppose you are hired to haul away the waste left over from place that develops film. It turns out the waste actually contains lor of silver nitrate' You decide you will treat the waste with copper metal in order to recover the silver and cash in. The relevant equation is: AgNO; Cu Cu(NO;)1 2 Ag 169.89 glmol 63.55 glmol A stoichiometric calculation you need to work through for this type of scheme involves relat- ing how much copper it takes t0 react with a given amount of the silver nitrate_ You need the molar masses of the silver nitrate and the copper as shown above: You also need mol-to-mol ratio that relates the two different chemicals (silver nitrate and copper) . From the balanced equation we can see thar this ratio is mol Cu/2 mols AgNO;; Ifthe waste you have contains 100.0 grams of silver nitrate, how many mols of silver nitrate is this? (Use the molar mass of the silver nitrate from abovel ) If you found that your waste contained 0.5886 mols of silver nitrate how many mols of copper would you need to react with it? (Use the mol-to-mol ratio' mol Cu/2 mols AgNO;) If you found that you need 0.2943 mols of copper; how many grams of copper do you need? (Use the molar mass of copper from above! ) Note that the three conversions YOU just did above can be strung together as shown below: g AgNO; mols AgNO; mols Cu g Cu Imol AgNO; I mol Cu 63.55 g Cu 100.0 g AgNO,X 169.89 g AgNO; 2 mol AgNO; [ mol Cu

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