molar mass acid = 192 g/mol
Explanation
Concentration KOH = 0.100 M
volume KOH = 16.5 mL = 0.0165 L
moles KOH = (concentration KOH) * (volume KOH in Liter)
moles KOH = (0.100 M) * (0.0165 L)
moles KOH = 0.00165 mol
Since acid is monoprotic, moles acid = moles KOH
moles acid = 0.00165 mol
molar mass acid = (mass acid) / (moles acid)
molar mass acid = (0.317 g) / (0.00165 mol)
molar mass acid = 192.12 g/mol
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