eq q (1 Viewer)

[=)(=]

How can you have a negative equilibrium concentration?

 

[Vall]

I think the question is a little scuffed. How can there be 5.56 moles of CH4 at equilibrium? To do this more CS2 would be needed (and as there isn't enough we get some negative concentrations like you've pointed out).
edit: maybe the question meant to say the concentration of CH4 at equilibrium was 5.56 mol / L