Potassium Dichromate, K₂Cr₂O₇, Is Used in Tanning Leather, Decorating Porcelain

question 84

Multiple Choice

Potassium dichromate, K₂Cr₂O₇, is used in tanning leather, decorating porcelain and water proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K₂Cr₂O₇.

• A) 9.490 *10²⁵ Cr atoms
• B) 2.248 * 10²⁴ Cr atoms
• C) 1.124 * 10²⁴ Cr atoms
• D) 3.227 *10²³ Cr atoms
• E) 1.613 * 10²³ Cr atoms

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