Answer:
Explanation:
In this, we can with the <u>ionization equation</u> for the hydrazoic acid (). So:
Now, due to the Ka constant value, we have to use the whole equilibrium because this <u>is not a strong acid</u>. So, we have to write the <u>Ka expression</u>:
For each mol of produced we will have 1 mol of . So, we can use <u>"X" for the unknown</u> values and replace in the Ka equation:
Additionally, we have to keep in mind that is a reagent, this means that we will be <u>consumed</u>. We dont know how much acid would be consumed but we can express a<u> subtraction from the initial value</u>, so:
Finally, we can put the ka value and <u>solve for "X"</u>:
So, we have a concentration of 0.000285 for . With this in mind, we can calculate the <u>pH value</u>:
I hope it helps!
The vapour pressure of a substance actually differs
relative to the temperature. So to know which compound has the vapour pressure
of 58 kilopascals at 65 degrees Celsius, we refer to standard tables of
temperature vs Vapour pressure.
From the tables or graph, the answer here is:
<span>2. ethanol</span>
<h2>Hello!</h2>
The answer is: H2O
<h2>
Why?</h2>
The critical temperature (also known as the critical point) is the temperature above a vapor or gas can't be liquefied no matter how many pressure can be applied. Every substance has a critical temperature which varies according to the substance/compound nature.
For example, the water has a critical temperature of 373.94 °C, it means that above that temperature the vapor and liquid phases can't be distinct and there is no possible way that the vapor became liquid again no matter how many pressure is applied.
The critical temperature of the given elements/compounds are:
H2 : -240 °C
N2: -147 °C
NH3: 132.4 °C
H2O: 373.94 °C
Have a nice day!
Explanation:
Given the mass of HCl is ---- 0.50 g
The volume of solution is --- 4.0 L
To determine the pH of the resulting solution, follow the below-shown procedure:
1. Calculate the number of moles of HCl given by using the formula:
2. Calculate the molarity of HCl.
3. Calculate pH of the solution using the formula:
Since HCl is a strong acid, it undergoes complete ionization when dissolved in water.
Thus,
Calculation:
1. Number of moles of HCl given:
2. Concentration of HCl:
3. pH of the solution:
Hence, pH of the given solution is 2.47.