What was the percent of caco3 by mass in the limestone
When a 1.25-gram sample of limestone was dissolved in acid, 0.44gram of CO2 was generated. If the rock was dissolved in acid, carbonate other than CaCO3, what was the percent of CaCO3 by mass in the limestone?
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A survey of 200 ninth-graders found that 31.5% had used cigarettes in the past week, and a survey of 250 high-school seniors found that 35.2% had used cigarettes in the past week. Is there significant difference between the two corresponding popul
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