It is to be assumed that the unit of the given concentration is in molarity. To determine the number of moles given molarity and volume, we use the equation,
m = (M)(V)
volume should be in liters. Substituting the known values,
m = (0.350)(0.40 L)
m = 0.14 mols
Then, multiply the number of moles by the molar mass of KOH which is equal to 56.1056 g/mol.
mass = (0.14 mols)(56.1056 g/mol)
mass = 7.855 grams
Answer: 7.855 grams
