Calcium Sulfate Is a Desiccant Used for Storage of Samples

question 104

Multiple Choice

Calcium sulfate is a desiccant used for storage of samples and equipment in a dry atmosphere because it absorbs water from air. The relevant thermodynamic reaction equation is given below. At what temperature will this reaction reverse to release the water and regenerate the dry desiccant? H   104.9 kJ/mol, S   291.2 J/(mol K)

• A)58  C
• B)78  C
• C)98  C
• D)68  C
• E)87  C

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Bartolomé de Las Casas

A 16th-century Spanish friar, historian, and advocate for the rights and dignity of Native Americans, denouncing their oppression and exploitation by Europeans.

Spanish Conquistadores

Spanish explorers and soldiers who conquered vast territories in the Americas, including the Aztec and Inca empires, in the 16th century.

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