At night, an equilibrium reaction between two different nitrogen compounds generates N2O5 in the atmosphere, as represented below.
Reaction 1: NO3(g) + NO2(g) ⇄ N2O5(g) K = 2.6×10−11

A mixture of NO3 and a ten-fold excess of NO2 are placed inside a rigid container at constant temperature and allowed to reach equilibrium. Which of the following provides a correct comparison of the equilibrium concentrations of these chemical species, and why?

a. [N2O5] << [NO3] because a small K value indicates that the consumption of the reactants is favored at equilibrium.
b. [NO2] << [N2O5] because a small K value indicates that the consumption of the reactants is favored at equilibrium.
c. [NO2] << [NO3] because a small K value indicates that the formation of the products is not favored at equilibrium.
d. [N2O5] << [NO2] because a small K value indicates that the formation of the products is not favored at equilibrium.

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.