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Hỗn hợp X có khối lượng 82,3 gam gồm KCIO3, Ca(CIO3)2, CaC2l, và KCl. Nhiệt phân hoàn toàn X thu được 13,44 lít O2, (đktc), chất rắn Y gồm CaCl2, và KCl. Toàn bộ Y tác dụng vừa đủ với 0,3 lít dung dịch K2CO3 1M thu được dung dịch Z. Lượng KCl trong 2 nhiều gấp 5 lần lượng KCltrong X. Phần trăm khối lượng CaCl2, trong X là
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