How many moles of calcium oxide will be produced when 3.0 moles of iron(III)oxide (Fe2O3) reacts with calcium phosphate Ca3(PO4)2 according to the following reaction:
Fe2O3 + Ca3(PO4)2 → 2 Fe(PO4) + 3 Cao

I’m really not sure what’s the answer. sorry

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.

The image seems to be behind the mirror, but nothing is really there.just took the test.