Phosphorite is a mineral that is 25%other non-phosphorus materials and 75% calcium phosphate. Calculate the mass of P4(s) can be formed from 1.0Kg of phosphorite assuming an 80% yield of phosphorus from the calcium phosphate present.
2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) -------> 6CaSiO3 + P4(s) + 10CO(g)