2.79g of an organic compound when heated in Carius tube with conc.`HNO_(3) and H_(3)PO_(4)` formed converted into `MgNH_(4)*PO_(4)` ppt. The ppt. on heating gave 1.332 g of `Mg_(2)P_(2)O_(7)` . The percentage of P in the compound is

Options

A. `23.3%`
B. `13.33%`
C. `33.33%`
D. `26.66%`

Answer

B

Explanation

Percentage of P`=(62)/(222)times("wt.of" Mg_(2)P_(2)O_(7))/("wt.of compoud")times100=(62)/(222)times(1.332)/(2.79)times100=13.33%`