When strongly heated,boric acid breaks down to boric oxide and water.What mass of boric oxide is formed from the decomposition of 15.0 g of boric acid,B(OH)₃? 2 B(OH)₃(s)→ B₂O₃(s)+ 3 H₂O(g)

Question

Quizplus · Accepted Answer

From the balanced chemical equation, we can see that the molar ratio between B(OH)3 and B2O3 is 2:1. 
First, we need to find the amount of boric acid in moles:
15.0 g B(OH)3 x (1 mol B(OH)3/61.83 g B(OH)3) = 0.2423 mol B(OH)3
Next, we can use the mole ratio to find the moles of B2O3 produced:
0.2423 mol B(OH)3 x (1 mol B2O3/2 mol B(OH)3) = 0.1212 mol B2O3
Finally, we can convert the moles of B2O3 to grams:
0.1212 mol B2O3 x (69.62 g B2O3/1 mol B2O3) = 8.44 g B2O3 
Therefore, the correct answer is C) 8.44 g.

When Strongly Heated,boric Acid Breaks Down to Boric Oxide and Water.What