no of moles = molarity * volume in liters
molarity = 8.26*10-2 M
volume = 0.437 L
moles = 8.26*10-2 M * 0.437 L
moles = 0.0360962 moles
mass = moles * molar mass
molar mass of potassium sulfate => 174.259 g/mol
mass of solute = 0.0360962 mol * 174.259g/mol => 6.29 g
answer => 6.3 grams
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