The mass of NaOH that is necessary to neutralize 8.90 mol of HCl is 356 grams.
<h3>How we convert moles into mass?</h3>
Mass of any substance will be calculated from moles by using the below equation as:
n = W/M, where
W = required mass
M = molar mass
Neutralization reaction will be:
NaOH + HCl → NaCl + H₂O
From the stoichiometry it is clear that 1 mole of NaOH is required to neutralize 1 mole of HCl, so that 8.90 moles of NaOH is needed.
Mass of 8.9 moles of NaOH = (8.9mol)(40g/mol) = 356g
Hence required mass of NaOH is 356 grams.
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