Le Chatelier shifts when SO2 is added, SO3 removed, vessel shrinks

[briman]

consider the reaction
2SO2 + O2 <---> 2SO3

A SHIFTS TO THE LEFT
B SHIFTS TO THE RIGHT
C NO CHANGE

ADDITIONAL SO2 IS INJECTED INTO REACTION VESSEL
I PICKED B

SOME SO3 IS REMOVED FROM THE REATION VESSEL
I PICKED B AGAIN

THE SIZE OF THE REACTION VESSEL IS DECREASED
NOT SURE B OR C

SOME He IS INJECTED INTO REATION VESSEL
NOT SURE B OR C

 

[chemisttree]

The questions you have concern the 3rd and 4th question. Explain why you pick b or c for these questions.

 

[briman]

i guess the question is does the pressure increase and does that efect the equlibrium

 

[chemisttree]

Putting more material in the same volume or the same amount of material in a smaller volume changes the concentration of the material... and you know how changing the concentration affects equilibrium.