I forgot how to do percentage error, actually I kind of forgot what it is. I do remember multiplying somthg by 100% but i can't remember what i divide b4 that.
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In terms of percent error with regards to an accepted value:
Suppose you measured the atomic molar mass of lithium to be 8 g/mol. The accepted value is 6.94. You take the difference, which is 1.06g/mol, and the percent error is therefore +15.27% ie. 1.06/6.94 * 100%