The following statements about carbon dioxide are true except
a. it can be prepared by the action of acid on caco₃
b. it is used in fire extinguishers
c. it dissolves in water at room temperature
d. it sublimes rather than melts at 20 ̊c and 1 atm pressure
e. it is a product of photosynthesis in plants

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).