15. underline ( )H_(2)CrO_(4)+underline ( )B(OH)_(3)arrow underline ( )H_(2)O+underline ( )B_(2)(CrO_(4))_(3)

This is a chemical reaction question. The reaction is between chromic acid (H2CrO4) and boron hydroxide (B(OH)3). The products of the reaction are water (H2O) and boron chromate (B2(CrO4)3). The balanced chemical equation for this reaction is:<br /><br />3H2CrO4 + 2B(OH)3 → 6H2O + B2(CrO4)3<br /><br />This equation is balanced because there are the same number of each type of atom on both sides of the equation. This is a fundamental principle in chemistry known as the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.