2Fe(OH)x+xH2SO4->Fe2(SO4)x+2xH2O
2Fe(OH)x + xH2SO4 →Fe2(SO4)x + 2xH2O
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We are looking for ____ place to spend ____ night.
Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.