Answer to Question #161872 in Chemistry for Covenant

Question

What is the % of Na in a 0.721g detergent sample. Final yield is 0.320g NaP2O4.

Answer 1

First, calculate the mass of sodium in the NaP₂O₄ sample:

m(Na) = m(NaP₂O₄) × Mr(Na) / Mr(NaP₂O₄) = 0.320 g × 23 g / 149 g/mol = 0.05 g

Second, calculate % of Na in a detergent sample:

% Na = (m(Na) / M_sample) × 100 % = (0.05 g / 0.721 g) × 100 % = 3.6 %

Answer: 3.6 %