Stoichiometry Practice Problem Solution

Stoichiometry Practice Problem Solution - Stoichiometry...

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Stoichiometry Practice Problem 3 Cu(NO 3 ) 2 ( aq ) + 2 K 3 PO 4 ( aq ) Æ Cu 3 (PO 4 ) 2 ( s ) + 6 KNO 3 ( aq ) 1 What mass of copper (II) phosphate should form if 0.191 mol of Cu(NO 3 ) 2 are used? 2 How many mL of 0.125 M K 3 PO 4 are needed to react completely with 50.0 mL of 0.100 M Cu(NO 3 ) 2 ? 3 When 25.5 g of copper (II) nitrate react with 25.5 g of potassium phosphate, what mass of copper (II) phosphate should form? A note on significant figures: You should always use one extra digit until the final answer. So, in this problem each requires three significant figures. That means that we should use molar masses with at least 4 significant figures. Molar masses I have reported these to 5 significant figures. That is almost always adequate. Cu(NO 3 ) 2 187.56 g/mol= K 3 PO 4 212.27 g/mol Cu 3 (PO 4 ) 2 380.58 g/mol KNO 3 101.10 g/mol 1. 2 4 3 2 4 3 2 4 3 2 3 2 4 3 2 3 2 24 1 58 380 3 1 191 0 ) PO ( Cu g . ) PO ( Cu mol ) PO ( Cu g . ) NO ( Cu mol ) PO ( Cu mol ) NO ( Cu mol . = 2. 4 3 3 4 3 4 3 2 3 4 3 2 3 2 3 2 3 3 125 0 7 26 10 1 125 0 1
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This note was uploaded on 09/30/2011 for the course CHEM 1220 taught by Professor Barber during the Spring '08 term at Wayne State University.

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