# Chemistry

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Suppose that you start with .303g of copper wire and faithfully follow the procedure. at the end you find that the copper dust weighs .309g. base on your understanding of the experimental procedure, offer at least two rational explanations for this apparent violation of the law of conservation of mass.

• Chemistry -

Missy--
This is the first of three posts I've read today by you, all dealing with Cu and/or Cu3(PO4)2. Yet you give no clue as to what experiment you are doing, what has been added, or any of the details. If you want help here you must provide more data than that. I will ignore the other two posts (later than this one).

• Chemistry -

Mass of beaker with copper=57.758g
Mass of copper=.243g
.157M X.025L=.003925mols
.003925molsX (1 molCu/i mol Cu(NO3)2) X (63.55g Cu/1 mol Cu)=.25
.243/.25=97.2 % yield

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