Consider the surface of a si wafer that has a (100) plane: (12 points) 1.1. sketch the placement of si atoms on the surface of the wafer. 1.2. determine the number of atoms per cm2 at the surface of the wafer. 1.3. repeat part a., this time taking the surface of the si wafer to be (110). 1.4. repeat part b., this time taking the surface of the si wafer to be (110)

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .