Calculate the percent of carbon, hydrogen, nitrogen, and oxygen in this widely used pesticide, Sevin. The molecular formula is C12 H11 O2 N.

Answer 1

For illustration purposes, I use approximate relative atomic masses:
RMM for C12H11O2N
=12*12 + 11*1 + 2*16 + 14
= 201
Percentage of Carbon
=12*12/201
=0.716
=71.6%
Percentage of the remaining elements can be calculated similarly. Use accurate values from periodic tables.