State carbon monoxide and water vapor

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An equilibrium mixture contains 0.750 mol of each of the products (carbon dioxide and hydrogen gas) and 0.200 mol of each of the reactants (carbon monoxide and water vapor) in a 1.00-L container.

CO(g) + H2O(g) <------> CO2(g) + H2(g)

How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0.300 mol?

Please help I tried many times but could not get it right.

Reference no: EM13166795

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