Answer to Question #161753 in Physical Chemistry for Sikoki Isaiah Richman

Question

Calculate the % sodium in a 0.721 g detergent sample. 

Final yield is 0.320 g NaP₂O₄

Answer 1

Moles of NaP₂O₄ = 0.320/149

= 0.00215 mol

So, moles of Sodium is also = 0.00215 mol in NaP₂O₄

As we know according to law of conservation of mass,

Moles of sodium in detergent is also = 0.00215 mol

So, mass of Sodium = mole × molar mass

= 0.00215 × 23 = 0.0494 g

%Sodium = $Mass of Sodium×100/Total Mass$

= 0.0494×100/0.721

= 6.85 %

% Sodium = [6.85] %