To calculate formality, we need to know the number of moles of dichloromethanic acid and the volume of the solution in liters.
Number of moles = mass / molecular weight
= 6.447 g / 128.94 g/mol
≈ 0.05 mol
Formality = number of moles / volume (in liters)
= 0.05 mol / 0.5 L
= 0.1 F
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