Post-UTME Chemistry 2012 Objective — Question 9

Question 9 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

The solubility of Na3AsO4(H2O)12 is 38.9g per 100g H2O. What is the mass percentage of Na3AsO4 in the saturated solution? (As=75, Na=23, O=16, H=1)

A. 87.2%
B. 38.9%
C. 19.1%Correct
D. 13.7%

Explanation

Flagged: this multi-step hydrate mass-percentage calculation gave results that did not cleanly match the listed options when computed independently; the closest option is given with reduced confidence. (No printed answer key for this session; answer worked out independently.)

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