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0.40g of an organic compound containing ...

0.40g of an organic compound containing phosphorus gave 0.555 g of `Mg_(2)P_(2)O_(7)` by usual analysis calculate the % of phosphorus in the organic compound

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`% of P = 62/222xx0.555/0.40 xx100=38.75%`
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0.12 gm of an organic compound containing phosphorus gave 0.22 gm of Mg_2P_2O_7 by the usual analysis. Calculate the percentage of phosphorus in the compound.