14. Cis-1,2-dichloroethylene in vinylidene chloride was determined by gas chromatography using toluene as an internal standard, and the following data for the calibration curve were obtained:
Sx/St 0.72 0.90 1.08 1.28
w,% 0.5 1 1.5 2

Calculate the mass fraction (%) of cis-1,2-dichloroethylene in the test sample using the following data on the peaks of the analyte and standard substance (take k=1)
Cis-1,2-dichloroethylene peak Toluene peak
Base Height Base Height
14 42 18 45

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