Draw the structural formula of butane (c4h10). what class of organic molecule is butane? . describe an isomer. draw an isomer of butane..

   H  H H  H
    !   !   !   !
H-C-C-C-C-H :Butane
    !   !   !   !  
   H  H H H

butane is an alkane

an organic isomer is a chemical with the same molecular formula as another but different molecular structure

            H
     H H-C-H  H
      !      !       !
H - C  -  C  -  C - H : 2-methyl propane 
      !       !       !
     H      H     H

Hope that helps

A) the enthralling of formation for pure element in its standard state is always positivehope this : )

Isec i will do it and them i will let you know