Elemental phosphorus is made by heating calcium phosphate with carbon and sand in an electric furnace. What quantity of calcium phosphate, in kilograms, must be used to produce 15.0kg of phosphorus?
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The equation for reaction is:
2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) --> 6CaSiO3(l) + 10 CO(g) + P4(g)
The expert calculates the kilograms of elemental phosphorous.