How many moles of carbon in 130g of c2h6

 7.22 moles of C2H6. Since there are 2 carbon atoms per C2H6, we must multiply the number of moles of C2H6 by 2 to get the number of moles of Carbon which is 14.4 or 14 if using two sig figs.

C2H6's molar mass is (12+12+6) = 30 grams. if we use stoichiometry we find that
130 grams of C2H6 holds approximately 4.33 moles of the molecule. If we know that there are 2 moles of pure carbon person 1 mole of ethane(C2H6) we can use stoichiometry once more to multiply 2 by 4.33 to find the number of moles of carbon in 130 grams of ethane which is approximately 8.67 moles. 

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic