How does matter affect mass? Matter does not affect the mass of an object.
Increasing mass can cause matter to decrease.
The more matter an object contains the more mass it may have.
Less matter can increase the mass of an 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)