Масса 0,2 mol кристаллогидрата равна 42 g. Определите его формулу.
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CuSO₄ ⋅ 5H₂O
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MgSO₄ ⋅ H₂O
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MgSO₄ ⋅ 5H₂O
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CuSO₄ ⋅ H₂O
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