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April 8th, 2011, 05:51 AM  #1 
Senior Member Joined: Feb 2010 Posts: 133 Thanks: 0  Percentage error
If a balance accurate to two decimal places was used to record the mass of ethanol collected, what would be the percentage error due to the balance readings if the total mass of ethanol collected was 20.10 g? Why is it (2 * 0.005)/20.1 * 100 NOT (0.005/20.1)*100 

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