Chapter%203%20in%20class%20problems

Chapter%203%20in%20class%20problems - Example Questions for...

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Example Questions for Chapter 3 Determine the mass percent composition of copper(II)nitrate to 3 SF How many H atoms are in 2.50 g of C 2 H 6 O? Calculate the number of (PO 4 ) 3- ions in 2.5 × 10 -3 mol Mg 3 (PO 4 ) 2 . What mass of Ca 3 (PO 4 ) 2 is needed for an experiment that requires 0.836 moles Ca 2+ ?
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A compound was analyzed in the lab and found to contain 69.6% Mn and 30.4% O. What is the empirical formula? Ascorbic acid (Vitamin C) has the empirical formula C 3 H 4 O 3 . The molecular weight is 176. What is the molecular formula? Analysis of an unknown compound gave: 39.72% C,1.67% H and 58.61% Cl. The molecular weight was found to be 181.4. Determine the molecular formula.
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This note was uploaded on 10/25/2009 for the course CHEM 121 taught by Professor Wyzlouzil during the Fall '07 term at Ohio State.

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Chapter%203%20in%20class%20problems - Example Questions for...

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