Answer:
- Option <u><em>C) The rates of the forward and reverse reactions are equal.</em></u>
Explanation:
NO₂ and N₂O₄ undergo the following <em>equilibrium</em> reaction:
That is a reversible reaction, i.e. there are two simultaneous reactions: the direct or forward reaction and the reverse reaction:
- Direct reaction: 2NO₂(g) → N₂O₄(g)
- Reverse reaction: 2NO₂(g) ← N₂O₄(g)
At the beginning, only NO₂(g) is in the sealed container. The NO₂ concentration is maximum, and the rate of the forward reaction is maximum.
As the reaction progresses, the concentration of NO₂ diminishes, and, consequently, the rate of the forward reaction decreases.
As soon as the N₂O₄ appears, the reverse reaction starts. At the beginning the rate is low, but as the N₂O₄ concentration increases the rate of the reverse reaction increases.
When both forward and reverse rates become equal the equilibrium has been reached. This is what is called a dynamical equilibrium.
Then, as per the choices, you have that, at equilibrium:
<u>A) No N₂O₄ is present</u>:
- False: as explained above, at equilibrium both NO₂ and N₂O₄ are present.
<u>B) No chemical reactions are occurring</u>.
- False: as explained above, at equilibrium both forward and reverse reaction are occurring at the same rate.
<u>C) The rates of the forward and reverse reactions are equal</u>.
- True: as explained, this is the meaning of dynamic equilibrium.
<u>D) The maximum number of molecules has been reached</u>.
- False: the number of molecules of each compound at equilibrium will be given by the constant of equiibrium, Keq = [N₂O₄] / [NO₂]², and this value varies with the temperature.
The word can be conclusion, but it can't be if the ''L'' is capitalized
Chlorophyll is the chemical that helps plant cells grow
Answer:
The molar mass of water is 18 grams per mole. So in 18 grams of water, there are 6.02 x 1023 molecules.
One gallon of water is equal to 3.7854118 liters. If we assume that the water is at 4 °C (to keep things simple), the density of water is exactly 1 gram per milliliter, or 1 kilogram per liter. So 1 gallon of water at 4 °C weighs exactly 3.7854118 kilograms, or 3785.41118 grams.
If one mole of water weighs 18 grams, then there are 210.30 moles of water in a gallon. Since one mole of water is made up of 6.02 x 1023 molecules, in one gallon of water there are 1.266 x 1026 molecules.
That is: 126600000000000000000000000 molecules!
If we multiply that by the number of atoms in a single water molecule -- 3 atoms -- then we get:
379800000000000000000000000 atoms!
