The decomposition of dimethyl ether, (CH3)2O(g) ® CH4(g) + H2(g) + CO(g), is first-order with a half-life of 1733 s at 500oC. In an experiment at this temperature, if [(CH3)2O]is 0.033 M after 865 s, what was the original concentration of the dimethyl ether?