The diagram below shows four objects in the solar system which have equal masses. Which of these pairs of objects exerts the least gravitational force on each other? (3 points)
Object 1 and Object 3
Object 4 and Object 3
Object 1 and Object 2
Object 4 and Object 2

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)