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Methanol is made by reacting carbon monoxide with hydrogen. The reaction is reversible.

CO( g)+2H2( g)⇌CH3OH( g)\mathrm{CO}(\mathrm{~g})+2 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_{3} \mathrm{OH}(\mathrm{~g})

The forward reaction is exothermic.
Which combination of temperature and pressure gives the highest equilibrium yield of methanol?

temperature

/∘C/{ }^{\circ} \mathrm{C}

pressure

/ atmospheres

200

10

200

200

600

10

600

200

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The equation for the formation of sulfur trioxide from sulfur dioxide is shown.

2SO2( g)+O2( g)⇌2SO3( g)2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g})

The forward reaction is exothermic.
Which combination of pressure and temperature gives the highest equilibrium yield of sulfur trioxide?

pressure

temperature

high

high

high

low

low

high

low

low

0