<u>Answer:</u>
2.07 grams
<u>Explanation:</u>
We know that the molecular mass of 
is 138.205 grams.
In order to find out how many grams we need to make 200 mL having a potassium ion concentration of 0.150, we need to find the number of moles first.
M = moles / liters
0.150 = x / 0.200
x = 0.03 moles
Since there are 2 potassium atoms in each molecule of so we will divide this number by half and multiply it by the molecular mass.
0.03/2 = 0.015 moles
Mass of needed = 0.015 × 138.205 = 2.07 grams
Answer:
[HI] = 3.61 mol·L⁻¹; [H₂] = [I₂] = 0.446 mol·L⁻¹
Explanation:
1. Calculate Keq
H₂ + I₂ ⇌ 2HI
E/mol·L⁻¹: 0.335 0.335 2.83
![K_{\text{eq}} = \dfrac{\text{[HI]$^{2}$}}{\text{[H$_{2}]$[I$_{2}$]}} = \dfrac{2.83^{2}}{0.335 \times 0.335} = 65.4](https://tex.z-dn.net/?f=K_%7B%5Ctext%7Beq%7D%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BHI%5D%24%5E%7B2%7D%24%7D%7D%7B%5Ctext%7B%5BH%24_%7B2%7D%5D%24%5BI%24_%7B2%7D%24%5D%7D%7D%20%3D%20%5Cdfrac%7B2.83%5E%7B2%7D%7D%7B0.335%20%5Ctimes%200.335%7D%20%3D%2065.4)
2. Set up an ICE table.
Step 3. Calculate the equilibrium concentrations
![K_{\text{c}} = \dfrac{\text{[HI]$^{2}$}}{\text{[H$_{2}$][I$_2$]}} = \dfrac{(3.83 - 2x)^{2}}{(0.335 + x)^{2}} = 65.4](https://tex.z-dn.net/?f=K_%7B%5Ctext%7Bc%7D%7D%20%3D%20%5Cdfrac%7B%5Ctext%7B%5BHI%5D%24%5E%7B2%7D%24%7D%7D%7B%5Ctext%7B%5BH%24_%7B2%7D%24%5D%5BI%24_2%24%5D%7D%7D%20%3D%20%5Cdfrac%7B%283.83%20-%202x%29%5E%7B2%7D%7D%7B%280.335%20%2B%20x%29%5E%7B2%7D%7D%20%3D%2065.4)
[HI] = (3.83 - 2x) mol·L⁻¹ = (3.83 - 0.2223) mol·L⁻¹ = 3.61 mol·L⁻¹
[H₂] = [I₂] = (0.335 + x) mol·L⁻¹ = (0.335 + 0.1111) = 0.446 mol·L⁻¹
Check:
Close enough.
Answer:
sodium hydroxide
Explanation:
When sodium is dropped in cold water, it reacts explosively and burns with a golden yellow flame. The reaction is exothermic and vigourus. It form sodium hydroxide with the liberation of hydrogen gas.
Answer:
This is not an original answer
Explanation:
While you're going to the store, your acceleration changes. Some times it increases your overall speed sometimes it reduces it. Constant acceleration does not occur because it would mean that you would constantly accelerate and eventually go past the store. Even reduction of speed is a type of acceleration in physics. When you reach it, we can then calculate how much your velocity was on average and analyze how changing acceleration would've affected it.
<span>Aluminum has an atomic number of 13.
13P
14N</span>
