Limestone (CaCO₃,100

question 24

Multiple Choice

Limestone (CaCO₃,100.1 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 (128.1 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%

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