Question

Tetraboron carbide, B₄C, is a very hard substance used for grinding purposes, ceramics, and armor plating. Because boron is an efficient absorber of neutrons, B₄C is also used as a protective material in nuclear reactors. The reaction that forms B₄C from boron(III) oxide, B₂O₃, is

2 B₂O₃ + 7 C → B₄C + 6 CO (at 2400°C)

(b) What is the minimum mass of carbon, in grams, necessary to react completely with 24.720 g of boron(III) oxide, B₂O₃?

(d) What is the maximum mass, in grams, of B₄C that can be formed from the reaction of 24.720 g of boron(III) oxide, B₂O₃ with an excess of carbon?

(e) If 8.399 g of B₄C is isolated in the reaction of 24.720 g of boron(III) oxide, B₂O₃, with an excess of carbon, what is the percent yield?

Answer 1