Some Basic Concepts Of Chemistry Question 218
Question: The percentage of $ P _2O _5 $ in diammonium hydrogen phosphate $ {{(NH _4)}_2}HPO _4 $ is [CPMT 1992]
Options:
A) 23.48
B) 46.96
C) 53.78
D) 71.00
Show Answer
Answer:
Correct Answer: C
Solution:
$ \underset{2(36+1+31+64)=264}{\mathop{2{{(NH _4)}_2}HPO _4}},\equiv \underset{62+80=142}{\mathop{P _2O _5}}, $
% of $ P _2O _5=\frac{wt\text{. of }P _2O _5}{\text{wt of salt}}\times 100 $
$ =\frac{142}{264}\times 100=53.78% $ .
