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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

A

35

B

40

C

38.75

D

45

Text Solution

Verified by Experts

The correct Answer is:
C
`" % of P "=(62 xx 0.555 xx 100)/(222 xx0.4)=38.75`
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0.092 g of an organic compound containing phosphorus gave 0.111 g Mg_(2)P_(2)O_(7) usual analysis Calculate the % of phosphorus in the organic compound.

Estimation of phosphorous: Second method: A known mass of compound is heated with fuming HNO_(3) or sodium peroxide (Na_(2)O_(2) in Carius tube which converts phosphorous to H_(3)PO_(4) . Magnesia mixture (MgCl_(2)+NH_(4)Cl) is then added, which gives the percipate of magnesium ammonium phosphate (MgNH_(4).PO_(4)) which on heating gives magnesium pyrophosphate (Mg_(2)P_(2)O_(7)) , which is weighted. Percentage of P =("Atomic mass of P")/("Molecular mass of " Mg_(2)P_(2)O_(7)) xx ("Molecular mass of "Mg_(2)P_(2)O_(7) xx 100)/("Mass of compound")=(62)/(222) xx("Mass of " Mg_(2)P_(2)O_(7)xx 100)/("Mass of compound") 0.12 gm of and organic compound containing phosphorus gave 0.22 gm of Mg_(2)P_(2)O_(7) by the usual analysis. Calculate the percentage of phosphorus in the compound.

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MARVEL PUBLICATION-BASIC PRINCIPLES AND TECHNIQUES IN ORGANIC CHEMISTRY-Test your grasp
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