percent yeild?

Question

What's the percent yield of iron if 950 g of Fe3O4 underwent the reaction shown in the chemical equation below and 533 g of Fe was isolated from the reaction mixture. Fe3O4 (s) + 2 C(s) ----> 2 CO2 (g) + 3 Fe

A) 25.9%
B) 77.5%
C) 56.1%
D) None of the above.

Answer 1

1. divide 950 by the Mr of Fe3O4
2. Divide 533 by 3 x the Ar of Fe.
3. work out what fraction no. 2 is of no.1 and multiply by 100 to get the % yield.