Consider the generic reaction: 2 A(g)+ B(g)--> 2C(g).

Question

If a flask initially contains 1.0 atm of A and 1.0 atm of B, what will be the pressure in the flask if the reaction proceeds to completion? (Assume constant volume and temperature.)
answer is 1.5atm
how do you solve this

Answer 1

Well, the volumes of A and B are the same, and temp is the same, so the same number of moles of A and B are there, so you only will react half of B. Half of B is left, and you get 1atm of C, and half atm of B left, leaving pressure of 1.5 atm.