Given the structure of Se analog of an S8 ring structure and the atom numbering scheme as shown below,

Give the number of peaks in the 77Se (I = 1/2 , 7.6%) NMR spectrum of the compounds with substitution of Se in S positions indicated:
1. Se substitutions in positions 1 and 2
2. Se substitutions in positions 1 and 3
3. Se substitutions in positions 1, 2 and 4

In which of these cases are the two wave points considered to be in phase with each other?

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.