A student pipetted exactly 50.00 mL of 0.1038 M HCl into a 250-mL Erlenmeyer flask containing 0.3735 g of an antacid tablet. The solution was heated and boiled to remove any
CO2. Approximately 25 mL of water and three drops of phenolphthalein indicator was added
to the Erlenmeyer flask containing the HCl and antacid tablet. A 50 mL buret was rinsed and
filled with a 0.1017 M NaOH solution. The initial volume of the buret was read and recorded
as 2.30 mL. The NaOH solution was carefully added to the antacid/HCl solution until a
permanent very slight pink coloration was noticed. The buret was read again and recorded as
22.82 mL. Calculate the acid equivalent (g HCl/g antacid) of the antacid tablet.

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 

Idk the answer sorry