A 0535 G Sample of Pyrolusite Ore (Impure MnO₂)is Treated with with 1.42

question 9

Multiple Choice

A 0.535 g sample of pyrolusite ore (impure MnO₂) is treated with 1.42 g oxalic acid (H₂C₂O₄ ∙ 2H₂O) in an acidic medium.Following this reaction,the excess oxalic acid is titrated with 0.1000 M KMnO₄,36.6 mL being required.What is the % MnO₂ in the ore? The reactions are:
H₂C₂O₄ ∙ 2 H₂O(aq) + MnO₂(s) + 2 H⁺(aq) → Mn²⁺(aq) + 4 H₂O(l) + 2 CO₂(g)
5 H₂C₂O₄ ∙ 2H₂O(aq) + 2 MnO₄^-(aq) + 6 H⁺(aq) → 2 Mn²⁺(aq) + 18 H₂O(l) + 10 CO₂(g)

• A)34.4%
• B)61.1%
• C)2.33%
• D)1.22%
• E)38.9%

Recognize the role of psychology in workplace productivity and management.

Acknowledge the influence of media and repeated exposure on belief formation and misinformation.

Understand the significance of various figures and movements in 19th-century American reform efforts, such as Frederick Douglass, the American Anti-Slavery Society, and the temperance movement.

Identify and explain the sources of tension between reformers and the broader American society, including religious, political, and cultural aspects.

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