Tetraboric Acid, H₂B₄O₇, Is Prepared by Heating Boric Acid, H₃BO₃

question 158

Multiple Choice

Tetraboric acid, H₂B₄O₇, is prepared by heating boric acid, H₃BO₃ (a condensation reaction involving water loss) . If 400 mmol H₃BO₃ are used, what mass (g) of H₂O is formed, assuming quantitative stoichiometric conversion ?

• A) 7.21
• B) 9.01
• C) 0.320
• D) 0.500
• E) 5.77

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