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We first calculate for the number of moles of NaOH by dividing the given mass by the molar mass of NaOH which is equal to 40 g/mol. Solving,
                   moles of NaOH = (68.4 g/ 40 g/mol) = 1.71 moles NaOH
Then, we divide the calculate number of moles by the volume in liters. 
                     molarity = (1.71 moles NaOH / 0.875 L solution)
                       molarity = 1.95 M

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