Sodium borate decahydrate, Na2B4O7⋅10H2O is commonly known as borax. It is used as a deodorizer and mold inhibitor. A sample weighing 15.86 g is heated until a constant mass is obtained indicating that all the water has been evaporated off.
(a) What percent, by mass of Na2B4O7⋅10 H2O is water?
(b) What is the mass of the anhydrous sodium borate, Na2B4O7?
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