121. When determining fat in cocoa powder, for processing a sample weighing 1.500 g, 2.50 ml of monobromonaphthalene was taken, the refractive index of which is 1.6570. The refractive index of monobromonaphthalene after the extraction of fat decreased to 1.6420. Determine the fat content of cocoa if it is known that the refractive index of pure cocoa fat is 1.4630 and its density is 0.926.
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