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Here's how to calculate the molar mass of the acid:
1. Calculate moles of KOH:
moles KOH = (volume in L)
(concentration in mol/L)
moles KOH = (0.0164 L)
(0.08133 mol/L) = 0.00133 mol
2. Determine moles of acid:
Since the acid is monoprotic (donates one H+), it reacts in a 1:1 ratio with KOH.
Therefore, moles of acid = moles of KOH = 0.00133 mol
3. Calculate molar mass of acid:
molar mass = (mass of acid) / (moles of acid)
molar mass = (0.2688 g) / (0.00133 mol) = 202 g/mol
Therefore, the molar mass of the monoprotic acid is 202 g/mol.