Chemistry Help

For the reaction 2HI(g) <----> H2(g) + I2(g),
Kc = 0.0198 at 721K. What is the HI concentration at 721K if [H2] = 0.120 M and [I2] = 0.0150 M?

I'm getting .303 M but that's not one of the options.

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asked by Annika

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