(d) Estimation of phosphorous:
A known mass of compound is heated with fuming `HNO_(3)` or sodium peroxide `(Na_(2)O_(2))` in Carius tube which converts phosphorrous to `H_(3)PO_(4)` . Magnesia mixture `(MgCL_(2) + NH_(4)Cl)` is then added, which gives the precipitate of magnesium ammonium phosphate `(MgNH_(4).PO_(4))` which on heating gives magnesium pyrophosphate `(Mg_(2)P_(2)O_(7))` , which is weighed.
An organic compound has 6.2 % of phosphorus. On sequence of reaction, the phosphorous present in 10 gm of organic compound is converted of `Mg_(2)P_(2)O_(7)` . Find the weight of `Mg_(2)P_(2)O_(7)` formed.
A. 2.22 gm
B. 10.0 gm
C. 4.44 gm
D. 1.11 gm
