4. To analyze methanol–water mixtures, the absorption of standard solutions was measured at 1.94 μm:
w(water), %…….26.0 29.0 32.0 37.0
A1.94 ………….0.470 0.500 0.532 0.585
Determine the mass fraction (%) of water and methanol in the mixture if A = 0.485.

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