2 Added MathJax formatting.
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Given that a 2-place balance is no more accurate than +/- 0.01 g$\pu{+/- 0.01 g}$, you shouldcan say that the two measurements were within 0.01 g$\pu{0.01 g}$ of the average, 12.53$\pu{12.53g}$, andthen just use that (thethis average) for your calculations.

Given that a 2-place balance is no more accurate than +/- 0.01 g, you should say that the two measurements were within 0.01 g of the average, 12.53, and just use that (the average).

Given that a 2-place balance is no more accurate than $\pu{+/- 0.01 g}$, you can say that the two measurements were within $\pu{0.01 g}$ of the average, $\pu{12.53g}$, then just use this average for your calculations.

1
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Given that a 2-place balance is no more accurate than +/- 0.01 g, you should say that the two measurements were within 0.01 g of the average, 12.53, and just use that (the average).