Homework Help: Chemistry

Posted by Kegahn on Friday, April 6, 2007 at 10:55am.

Magnesia (MgO) is used for fire brick, crucibles, and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3) at around 1200 oC.

1. Calculate the equilibrium pressure of CO2(g) (in atmospheres) above MgCO3(s) at 298 K.

2. Calculate the equilibrium pressure of CO2(g) (in atmospheres) above MgCO3(s) at 1200 K.

Write the equation:

MgCO3 (s) <> CO2 (g) + MgO (s)

keq= [CO2]

now [CO2] is in units of moles/liter for the gas.

But moles/liter= Pressure/R*T
or Pressure= moles/liter *RT
Pressure= keq*RT

check my thinking

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