From the concetration of `C_(4)H_(9)Cl` (butyl chloride) at different times given below, calculate the average rate of reaction:
`C_(4)H_(9)Cl+H_(2)O rarr C_(4)H_(9)OH+HCl`
during different intervals of time.
`|{:([C_(4)H_(9)Cl] (mol L^(-1)),t (s)),(0.100,0),(0.0905,50),(0.0820,100),(0.0741,150),(0.0671,200),(0.0549,300),(0.0439,400),(0.0210,700),(0.017,800):}|`