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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: xtheunknown0 on July 08, 2011, 05:23:41 AM

Title: Another changing equilibrium question
Post by: xtheunknown0 on July 08, 2011, 05:23:41 AM

"Methanol is manufactured for use as a fuel for racing cars. It can be made by reaction between carbon monoxide and hydrogen:
CO(g) + 2H2(g) CH3OH(g); ΔH = –103 kJ mol–1
...
b Will a compromise be needed in the choice of temperature or pressure?"

My answer is no - if we lower temperature then K goes up (net forward reaction). If we increase pressure we get a lower volume => higher concentration of CH3OH.

Right? The answers just say 'temperature'.

Title: Re: Another changing equilibrium question
Post by: DevaDevil on July 08, 2011, 09:41:12 AM

Quote from: xtheunknown0 on July 08, 2011, 05:23:41 AM

If we increase pressure we get a lower volume

only at constant T, and if your volume is fixed (as it usually is), the temperature will go up in stead