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To calculate the number of moles use the following formula: n = m / rmm

The rmm for sodium hydroxide is (Na: 22.99 x 1) + (O: 15.99 x 1) + (H: 1 x 1) = 39.98 g / mol.

So... n = 67.23 g / 39.98 g / mol

= 1.68159 mol

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