<p>Here is a two-part practice problem. I did part a but I am unsure of how to do b.</p>
<p>An electric furnace makes phosphorus according to:</p>
<p>Ca3(PO4)2 (s) + 5 C (s) + 3 SiO2 (s) ----> 3 CaSiO3 (s) + 5 CO (g) + 2 P (l) (I balanced it already)</p>
<p>An initial reaction contains 1500 kg of calcium phosphate, 250 kg of carbon, and 1000 kg of SiO2.</p>
<p>(a). What is the maximum possible yield of phosphorus? I got 2.56 X 10^5 grams P using limiting reagents if you want to double-check.</p>
<p>(b). After the reaction is complete, the solid residue was analyzed and found to contain 3.8% C, 5.8% P and 26.6% Ca by mass. What was the actual amount of P produced?</p>
<p>I don't know how to do this part, thanks for the help! :)</p>