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違う 3つの物質の密度は熱とは異なる 最初に3つを冷蔵庫に入れて(同じ温度で)固体にし、冷蔵庫の温度を調整して(同じ温度で)どれが溶けているかを見てください
CaCO3+2HCl=CaCl2+H2O+CO2
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