Chemistry

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balloon is filled with 1.35 atm dimethyl ether gas and 5.25 atm of oxygen gas at 27 C degrees. They react: C2H6O (g) + 3O2 (g) --> 2CO2 (g) + 3H2O(g) The system is allowed to cool back down to 27 degrees Celsius following the reaction. assuming external pressure is still the same (6.60 atm), what is the new volume of the balloon? what is the partial pressure of carbon dioxide in the balloon?

any help please.. we use pv/t ? i don't understand. show work and please explain

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