A reaction generates hydrogen gas, H2, as a product. The reactants are mixed and sealed in a 250-mL vessel. After 20.0 minutes, 3.91x10-2 mol H2 have been generated.  Calculate the final concentration (in M) of H2 gas.

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A reaction generates hydrogen gas, H2, as a product. The reactants are mixed and sealed in a 250-mL vessel. After 20.0 minutes, 3.91x10-2 mol H2 have been generated. 

Calculate the final concentration (in M) of H2 gas. 

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