151-8 Prelab key and Report Common Mistakes (F13).pdf

151-8 Prelab key and Report Common Mistakes (F13).pdf - EXP...

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PRE Answer k 1. (4 pts. in the EPARATI key of Pre- ) Comprehen space below. ION AND -lab Assign nd and underst EXP D SPECTR nment tand the proc PERIMENT ROSCOPY edure. Then, T 8 Y OF COB , summarize a For were For for e BALT CO and outline th 0.0 questions Q2 e deducted for Q6 Q8, 1 pt each mistake. MPLEXE he procedure 0013 mo Q5, 2 pts. each mistake. t. was deducte ES l ed
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Discussion of common mistakes in Report #8 Many had calculated the wrong number of moles of CoCl 2 because they had not included the six water of crystallization in the molar mass. When the crystals were weighed, they contain the water molecules. Therefore, the molar mass must also include the six water molecules. The limiting reagent of this synthesis hence is CoCl 2 ·6H 2 O, not just CoCl 2 . Moles of CoCl 2 ·6H 2 O = Moles of CoCl 2 = Moles of Co(NH 3 ) 6 Cl 3 produced Supposed 0.0751 g of CoCl 2 (which is 0.000316 mole) is used in the synthesis, Theoretical yield in grams = (0.000316 mole )(267.3 g/mol) = 0.0845 g The actual yield in the report should be the same as recorded on the notebook pages.
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