Write a balanced equation for the reaction of dimethylether, CH30CH3, with oxygen, O2(g), forming the products carbon dioxide, CO2(g), and water, H2O(l). If the standard heat of formation of dimethylether is -184.1 kJ/mol, what is the heat of reaction, the heat of reaction, in kJ, for the combustion reaction of dimethylether? The standard heats of formation of CO2,(g) and H2O,(l) are -393.5 kJ/mol and -285.8 kJ/mol respectively. (Enter your answer as a signed number in scientific notation without units.)