An equilibrium mixture contains .870 mol i2 and .290 mol h2, Ask an Expert

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An equilibrium mixture contains .870 mol I2, and .290 mol H2 in a 1.00 L flask. I found the equilibruim constant to be .172 which is correct.
The next part of the question is: How many moles must be removed in order to double the number of moles of H2 at equilibrium?

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