Limestone (CaCO₃, 100

question 37

Multiple Choice

Limestone (CaCO₃, 100.09 g/mol) is present in many sedimentary rocks.Suppose the limestone in a 5.000 g rock sample is dissolved in hydrochloric acid, and then 33.30 mL of 0.1500 M Na₂C₂O₄ is added to precipitate the Ca²⁺ ions as CaC₂O₄ (128.10 g/mol) .What is the mass percent limestone in the original rock sample?

• A)10.00%
• B)12.80%
• C)17.35%
• D)85.31%
• E)66.67%

Recognize the practical applications and hazards associated with static electricity.

Understand the formation and discharge process of lightning.

Explain the functioning of devices based on static electricity, such as electroscopes and precipitators.

Distinguish between the flow of current in typical and lightning-related electrical circuits.

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