Question

Phosphoric
acid is widely used in carbonated beverages , detergents , toothpastes and
fertilizers . Calculate the mass percentage of H , P AND O in phosphoric acid
if atomis mases are H =1 , P=31 and O = 16

Answer 1

Atomic mass of HYdrogen= $1amu$

Atomic mass of Oxygen= $16amu$

Atomic mass of phosphorous= $31amu$

Total in $H_{3}P{O}_4=3+31+16\left(4\right)=98amu$

% by mass of Hydrogen: $\frac{100\times 1}{98}=1.02$%

of Oxygen:$\frac{100\times 64}{98}=65.31$%

of Phosphorous: $\frac{100\times 31}{98}=31.63$%