At a certain temperature, the equilibrium constant for the reaction of CO with 02 to produce C02 is 5.0 x 10-13. Calculate [C02] at equilibrium if...

I need help with these grade 12 chemistry questions. They are based on the equilibrium and organic chem unit. The answers that I keep getting do not match up to my classmates so I need more opinions and ways of solving these.

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3. At a certain temperature, the equilibrium constant for the reaction of CO with 02 to produce C02 is5.0 x 10-13. Calculate [C02] at equilibrium if 1.0 mol each of C0 and 02 are placed in a 1.0 L vesseland allowed to come to equilibrium. 2!!! + 02 9 2C02 4.Weak acids are an essential component of many biochemical processes. When 0.100 mol of fix a weakacid is dissolved in "sumcient water to make 1.0 L of solution, the solution is found to have a hydrogen ionconcentration of 1.34 x 10-3 M. Calculate K;i for this weak acid HX. HX <3 H+fa<9=+ X'rau)