Chemistry

The decomposition of ethane, C2H6, is a first-order reaction. It is found that it takes 212 seconds to decompose 0.00839 M C2H6 to 0.00768 M. What is the rate of decomposition (in mol/L-h) when [C2H6] = 0.00422 M?
A.
6.43 x 10^-3 mol/L-h
B.
6.34 x 10^-5 mol/L-h
C.
6.34 x 10^-3 mol/L-h
D.
6.304 x 10^-3 mol/L-h

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