Chapter 5, Problem 85QAP

Consider the following sketch. Each square in bulb A represents a mole of atoms X. Each circle in bulb B represents a mole of atoms Y. The bulbs have the same volume, and the temperature is kept constant. When the valve is opened, atoms of X react with atoms of Y according to the following equation:

$2\text{X}\left(g\right)+\text{Y}\left(g\right)\to {\text{X}}_2\text{Y}\left(g\right)$The gaseous product is represented as and each represents one mole of product.

(a) If $P_{\text{A}}=2.0$ atm, what is P₈ before the valve is opened and the reaction is allowed to occur? What is $P_{\text{A}}+P_{\text{B}}$?

(b) Redraw the sketch to represent what happens after the valve is opened.

(c) What is P_A? What is P_B? What is $P_{\text{A}}+P_{\text{B}}$? Compare your answer with the answer in part (a).