Answer to Question #137232 in General Chemistry for Todd

Question

A 0.785 g sample of a mixture of calcium carbonate and an inert impurity is heated strongly until the calcium carbonate fully decomposes according to the reaction below:

CaCO3 (s) → CaO (s) + CO2 (g)

The gaseous product of the reaction is collected in sealed 234.9 mL container over water at 25.0°C, and the pressure inside the container is measured to be 127.3 torr. The vapor pressure of water at 25.0°C is 23.8 torr. What was the percent by mass of calcium carbonate in the original mixture?

Answer 1

$81.23$