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A sample of \( K _{2} SO _{4} \cdot Al _{2}\left( SO _{4}\right)_{3} .24 H _{2} O \) contains \( 6.4 kg \) oxygen. Calculate mass of sulphur (in gram) in same sample. (1) 1280 (2) 1000 (3) 128 (4) \( 12.8 \)

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Potassium sulphate + aluminium sulphate = water 

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