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The variance is 247.9. The StDev. is the square root of the variance: 15.75. See http://www.mathsisfun.com/standard-deviation.htmlfor an easy-to-understand discussion of StDev and Var.
beta glucose
Glucose+ H2NNHC6H5 -------> Glucose Phenyhydrazone +H2O -------------> H2NNHC6H5 Glucose 2-ketophenyhydrazone + NH3 + C6H6NH -------------> Glucosazone + H2O H2NNHC6H5
make by dissolving 2g or glucose (or dextrose) in 100 ml water or by grinding one glucose tablets (4 grams/tablet; found in drugstores) in 200ml of water.
200 grams/1,000 mL x 100= 20%