During the Decomposition of CaCO₃(s)into CaO(s)and CO₂(g),100 $\circ$ C with an Atmospheric Pressure of 755 MmHg

question 173

Multiple Choice

During the decomposition of CaCO₃(s) into CaO(s) and CO₂(g) ,100.0 mL of gas is collected by the displacement of water in a flask at 25 ^$\circ$ C with an atmospheric pressure of 755 mmHg.The vapor pressure of water at this temperature is 23.8 mmHg.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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