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$$ mathrm R f=frac mathrm Length mathrm travelled mathrm by mathrm the mathrm solute remaining(mathrm cm correct) mathrm Length mathrm travelled mathrm by mathrm the mathrm solvent left(mathrm cm suitable) $$We at Whole Melt Extract haven't or will never jeopardize our quality and criteria to generate an extra buck, on the expense on the