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3.2 gm of coal in Kjeldahl’s experiment evolved NH3 gas was absorbed in 40 ml of 0.5 N H2SO4. After absorption the excess acid required 16 ml of 0.5N NaOH for complete neutralization. 2.5 gms of coal sample in quantitative analysis gave 0.42 gm BaSO4. Calculate the % N and S.
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