The decomposition of dimethyl ether, (CH3)2O, at 510ºC is a first-order process with a rate constant of 6.8 x 10-4 s-1.
(CH3)2O (g) ? CH4 (g) + H2 (g) + CO (g)
If the initial pressure of the ether is 135 torr, what is its partial pressure after 1420 s? (Note, since the volume and temperature don't change, the pressure is directly related to number of moles and so the pressure can be treated similar to concentration.)