When solid CaCO3 is heated, it decomposes to give solid CaO and CO2 gas. A volume of 425 mL of gas is collected over water as a total pressure of 758 mmHg and 16 degrees C. The vapor pressure of the water at 16 degrees C is 14 mmHg; CaCO3(s)-->CaO(s)+CO2(g): a) what is the partial pressure of the CO2 gas? b) How many moles of CO2 gas were in the CO2 gas sample