#CO_2# gas, in the dry state, may be produced by heating calcium carbonate. #CaCO_3 (s)DeltaCaO(s) + CO_2(g)#. What volume of #CO_2#, collected dry at 55 C and a pressure of 774 torr, is produced by complete thermal decomposition of 10.0 g of #CaCO_3#?
3.12 Liters if Dry Pressure is 656mmHg (Water Vapor Pressure - 118mmHg- is subtracted from 744mmHg), or 2.75 Liters if Dry Pressure is 744 mmHg. Calculation that follows is based upon 656mmHg dry pressure (=0.863Atm). Substitute 1.02Atm if 744mmHg is dry pressure.
From reaction ratios
= 0.10 mole
If a 'dry' volume is needed (
=> Dry Pressure = 774mmHg - 118mmHg = 656mmHg
Using the Ideal Gas Law =>
OR => If dry pressure is 774torr = 1.02Atm =>