# 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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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) $12.8$