Determine the empirical formula of kevla...

Determine the empirical formula of kevlar, used in making bullet proof vests, is `70.6% C,4.2% H,11.8%N and 13.4%O`:

`1`. `C_7H_5NO_2`

`2`. `C_7H_5N_2O `

`3`. `C_7H_9NO`

`4`. `C_7H_5NO`

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