The decomposition of formic acid vapor according to the following reaction at 550oC follows a first-order kinetics, and at the above temperature, the reaction has a half-life of 240 s.             HCO2H (g)   ®  CO2(g)  +  H2(g);                Rate = k[HCO2H]  If the initial concentration of HCO2H was 0.160 M, what is its concentration after four half-lives?  (A) 0.010 M                (B) 0.020 M                  (C) 0.040 M                  (D) 0.0050 M

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