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Bookmarks Tools Window Help C Search Text.. Bb PowerPointG what is the 48484/quizzes/44945/take/questions/530893 Sites HP - See What's H https: .dy/qa https:..981 Molecu C Search OHp . See what's .. " websi ce Gallery: Web Slice Gallery G G Google MYahoo tes The questions are taken from an FE review book DQuestion 11 1 pts What is the gravimetric (i.e., mass) percentage of oxygen in K2Cr04? Express your answer as an integer percentage (i.e., z9%) Previous No new data to save. Last checked at 8:23pm Submit Quiz

Explanation / Answer

Percent by mass is given by

K2 = 39 x 2 = 78

Cr2 = 52 x 2 = 104

O7 = 16 x 7 = 112

% by mass = 112/(78+104+112) = 56/142 = 29.9465%

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