Answer:
[Cl₂] = 0.1804M
Explanation:
The reaction of Si with Cl₂ is:
Si(s) + 2Cl₂(g) ⇄ SiCl₄(g)
Where equilibrium constant, k, is:
k = 0.30 = [SiCl₄] / [Cl₂]²
<em>Si(s) is not in the equilibrium reaction because pure solids don't take part in the equilibrium.</em>
As initial concentration of SiCl₄ is 0.10mol / 1L = 0.10M, when the equilibrium is established, concentrations are:
[SiCl₄] = 0.10M - X
[Cl₂] = 2X
<em>Where X is the reaction coordinate.</em>
Replacing in k equation:
0.30 = [0.10-X] / [2X]²
0.30 = [0.10-X] / 4X²
1.2X² = 0.10 - X
1.2X² + X - 0.10 = 0
<em>Solving for X:</em>
X = - 0.92M → <em>False solution. There is no negative concentrations.</em>
X = 0.0902M → Right solution.
[Cl₂] = 2×0.0902M = 0.1804M
<h3> [Cl₂] = 0.1804M</h3>
Answer:
A. Water changes from a gas to a liquid to a solid.
Explanation:
We can see the following points in the diagram:
- Point A: water starts at 0.5 atm and 100°C, so it is vapor (gas).
- Point B: water changes from vapor to liquid.
- Point C: water changes from liquid to solid.
- Point D: water as a solid reaches a temperature of -10°C.
So, water changes from a gas to a liquid to a solid.
Answer:
d. reducing agent
Explanation:
Na acts as a reducing agent. A reducing agent is a substance whose function is to reduce or donate electrons to another, and by doing so it becomes oxidized. We can see the mechanism of the reaction in the image attached below.