The gas phase decomposition of dimethyl ether at 500 C CH 3 OCH 3 (g) --- CH 4 (g) + H 2 (g) + CO(g) is first order in CH 3 OCH 3 with a rate...

The gas phase decomposition of dimethyl ether at 500 °C

CH3OCH3(g) ---> CH4(g) + H2(g) + CO(g)

is first order in CH3OCH3 with a rate constant of 4.00×10-4s-1.

If the initial concentration of CH3OCH3 is 0.129 M, the concentration of CH3OCH3 will be  ___________ M after 3155 s have passed.