posted by Veronica .
Calcium carbonate, CaCO3(s), decomposes upon heating to give CaO(s) and
CO2(g). A sample of CaCO3 is decomposed, and carbon dioxide is collected
in a 250 mL ﬂask. After decomposition is complete, the gas has a pressure
of 1.3 atm at a temperature of 31℃. How many moles of CO2 gas were