Astudent poured 50.0 ml of 1.25 mol/l nitric acid - hno3- into a polystyrene cup and recorded that the temperature was 23.5°c. she then added 50.0 ml of 1.25 mol/l potassium hydroxide-koh- and found the temperature rose to 32.4°c. i. write a chemical equation representing the neutralisation reaction of the two chemicals. 2 marks) ii. calculate the enthalpy of neutralisation, given that the specific heat of water is 4.18 j/goc and the density of the solutions was 1.00 g/ml. 4 marks] b) in a laboratory experiment, 2.20 g of propanone - c3hso- was burned completely in oxygen. the heat from this combustion was used to raise the temperature of 100g of water from 18.9°c to 96.3°c calculate the enthalpy of combustion of propanone in kj/mol.

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 

I’m not sure what your trying to say here.. can you clarify again?