Question

Superphosphate, a water soluble fertilizer, is sometimes marked as a "triple phosphate". It is a mixture of Ca(H2PO4)2 + 2CaSO4.
Ca3(PO4)2 + 2H2SO4 --> Ca(H2PO4)2 + 2CaSO4

If you treat 400g of calcium phosphate with 267g of sulfuric acid, how many g of superphosphate can be formed?

My question is, if this entire thing is superphosphate --> Ca(H2PO4)2 + 2CaSO4, do I have to add the mass of both Ca(H2PO4)2 and 2CaSO4? I've found the mass of Ca(H2PO4)2 to be 300g.
Yes. You find the mass of Ca(H2PO4)2 and add that to the mass of CaSO4 to find the mass of the "superphosphate".

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