1)x---->CaO--->y
2)E--->E2O3---->E3EO3
3)x--->y--->H2SO4
4)Cu--->x--->CuOH
5)Na--->Na2O--->NaOH
6)E--->P2O5--->y
1) 2) 3) 4)5)6)
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