Prelab Preparation of Rochelle Salt Name Date Section Suppose you are hired to h

Question

Prelab Preparation of Rochelle Salt Name Date Section Suppose you are hired to haul away the waste left over from a place that develops film. It turns out the "waste" actually contains a lot 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: 2 AgNO, CuCu(NO,) 2 Ag 169.89 g/mol 63.55 g/mol A stoichiometric calculation you need to work through for this type of scheme involves relat- ing how much copper it takes to 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 a mol to mol ratio that relates the two different chemicals (silver nitrate and copper). From the balanced equation we can see that this ratio is 1 mol Cu/2 mols AgNO, Ifthe waste you have contains 100.0 grams ofsilver nitrate, how many mols ofsilver nitrate is this? 1. (Use the molar mass of the silver nitrate from above!) ined 0.5886 mols of silver nitrate, how many mols 2. If you found that your waste conta of copper would you need to react with it? (Use the mol-to-mol ratio! 1 mol Cu/2 mols AgNO,) PRELAB 16

Explanation / Answer

1.) Moles = Weight of Molecule / Molecular weight

Moles of AgNO3 = 100.0 / 169.89

   Moles of AgNO3 = 0.588

2.) 2 moles of AgNO3 reacts with 1 mol of Cu

So thats why 1 mol of AgNO3 reacts with 0.5 mol of Cu

and 0.5886 moles of AgNO3 reacts with [0.5886*0.5 = 0.2943] mol of Cu.

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