Question

If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9 g of silicon carbide is produced. What is the percent yield of the reaction

Answer 1

Answer: The percent yield of the reaction is 83.5 %

Explanation:

The given balanced equation is

$SiO_2+3C\rightarrow SiC+2CO$

$SiO_2$ is the limiting reagent as it limits the formation of product and $C$ is the excess reagent.

According to stoichiometry :

60.08 g of $SiO_2$ produce = 40.11 of $SiC$

Thus 50.0 of $SiO_2$ will produce=$\frac{40.11}{60.08}\times 50.0=33.4$  of $SiC$

 Experimental yield of SiC = 27.9 g

Percent yield = $\frac{\text {Experimental yield}}{\text {theoretical yield}}\times 100=\frac{27.9g}{33.4g}\times 100=83.5\%$

Thus  percent yield of the reaction is 83.5 %