For the synthesis of boric acid; 7.94 g of anhydrous borax was taken and 15 mL of water was added and the mixture was heated until it dissolved. After adding 5 mL of HCl, 5.830 g of crystals were obtained from the mixture which was cooled in an ice bath. What is the percentage yield of the reaction?  (Na: 23; B: 11; O: 16; H: 1; Cl: 35.5 g/mol)  (%37 HCI : d:1.19g/mL, dH2O=1 g/mL)

Chemistry for Engineering Students
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Chapter3: Molecules, Moles, And Chemical Equations
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Problem 3.14PAE: 3.14 A number of compounds are used in cement, and reactions among them occur when water is added....
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For the synthesis of boric acid; 7.94 g of anhydrous borax was taken and 15 mL of water was added and the mixture was heated until it dissolved. After adding 5 mL of HCl, 5.830 g of crystals were obtained from the mixture which was cooled in an ice bath. What is the percentage yield of the reaction? 

(Na: 23; B: 11; O: 16; H: 1; Cl: 35.5 g/mol)  (%37 HCI : d:1.19g/mL, dH2O=1 g/mL)

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