How many moles of oxygen are required to burn 2.62 moles of ethanos

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Which of the following units is not an official si unit

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)