During the Decomposition of CaCO₃(s) into CaO(s) and O₂(g), 100

question 105

Multiple Choice

During the decomposition of CaCO₃(s) into CaO(s) and O₂(g) , 100.0 mL of gas is collected by the displacement of water in a flask at 25°C with an atmospheric pressure of 755 mm Hg. The vapor pressure of water at this temperature is 23.8 mm Hg. What mass of oxygen was collected?

• A) 0.679 mg
• B) 21.7 mg
• C) 12.9 mg
• D) 0.807 mg
• E) 126 mg

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