Chemistry

Carbon monoxide at a pressure of 1490 mmHg reacts completely with O2 at a pressure of 745 mmHg in a sealed vessel to produce CO2. What is the final pressure in the flask?
2CO2 (g) + O2 (g) -> 2CO2 (g)

I thought it was just a simple addition, but it was wrong.

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  1. First, redo your equation.
    ................2CO(g) + O2(g) ==> 2CO2(g)
    I...............1490.........745.............0
    C............-1490........-745............1490
    E.................0..............0..............1490

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  2. Just a different perspective. :-)
    ...............2CO(g) + O2(g) ==> 2CO2(g)
    I...............1490.........745.............0
    C...............-2x...........-x..............2x
    E.................0.............0..............2x
    Complete Rxn => 745 + (-x) = 0 => x = 745 mmHg
    P(CO2) = 2X = 2(745 mmHg) = 1490 mmHg

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