If 350.0 grams of cr2o3 are reacted with 235.0 grams of elemental silicon, 213.2 grams of chromium metal are recovered. what is the percent yield?

We calculate for the amount of chromium metal in the reactant by,
                            = 350 x (mass of Cr2/mass of Cr2O3) 
                                 = 350 x (104/152) 
                                   = 239.47 grams
The amount of Cr metal in the product is only 213.2 grams. Thus, the percent yield.
                        percent yield = (213.2 grams/239.47) x 100%
                                             = 89%

Compound with sulfer  is bright red