Help plz!
Objects that are very dense, such as iron, can decrease their density by spreading their mass out over
A. a larger mass
B. a larger volume
C. a larger density
D. a larger object

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)