I am both a Ph.D. chemist and a cook. For this chemist and cook, the density of granulated sugar is 196 g per CUP. If you check the USDA web site, they round off 1 cup to 200g. I think you need to recalibrate your scale. http://www.nal.usda.gov/fnic/foodcomp/search/
Finally, some recipes with large quantities of sugar fail to correct for the added volume of the sugar. I recall one recipe called for 8 cups of sugar with 9 cups of blueberries. Its author stated that it would yield 9 cups of preserves, which my wife later discovered to be incorrect. Using the information above, 8.0 cups of granulated sugar would increase the volume of the preserves by another 3.5 cups! The bottom line is that this recipe yielded about 12 cups of preserves, so be sure to sterilize enough containers!
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i know for a fact that you need to work backwards and plug in the equation D=M/V (density=mass over volume)
Molasses has a specific gravity of 1.4. So density would be 11.9 pounds per gallon.
Which has a greater density: The brown sugar you calculated in the previous question or white sugar with a mass of 12.72 g and a volume of 8 cm³?