Lithium and oxygen react to form lithium oxide. what is the balanced equation for this reaction?

Lithium is Li 
Oxygen gas is O2 
Lithium oxide is Li2O 
Unbalanced Equation is Li + O2 --> Li2O 
There's one O on right side, 2 Os on left, so make coefficient 2 on right side to balance the oxygens. 
Li + O2 --> 2 Li2O 
Now balance the lithiums. There are 4 Lis on right side; 1 Li on left, so make Li coefficient 4 to balance the lithiums. 
4 Li + O2 --> 2 Li2O 
This equation is now fully balanced. 
Therefore balanced equation is: 

4 Li + O2 --> 2 Li2O

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