Answer:
Explanation:
Given parameters:
pH of HNO₃ = 3.75
Unknown:
[OH⁻], concentration of hydroxyl ions = ?
pOH of the solution = ?
Solution
The pH or pOH scale is a convenient way of expressing the level of acidity or alkalinity of aqueous solutions.
The pH of a solution is the negative logarithm to base 10 of the hydrogen ion concentration of the solution:
pH = -log₁₀[H⁺]
pOH = -log₁₀[OH⁻]
For any aqueous solution, the sum of the pH and pOH is 14. That is;
pH + pOH = 14
Now solving for [OH⁻]:
HNO₃ + H₂O → H₃O⁺ + NO₃⁻
Since pH + pOH = 14
pOH = 14 - pH = 14 -3.75 = 10.25
since pOH = -log₁₀[OH⁻]
10.25 = -log₁₀(OH⁻)
[OH⁻] = inverse log₁₀(-pOH)
[OH⁻] = inverse log₁₀(-10.25) = 5.62 x 10⁻¹¹moldm⁻³
Answer:
Option (3)
Explanation:
Wind energy is directly derived from the wind. In the places where wind blowing is quite frequent, there wind mills are being set up, and the turbines in it rotates due to the prevailing wind. Due to this continuous motion of turbines, it collects the wind energy and it is being transferred into electrical energy.
It is cost-effective and does not produce any kind of pollution and is completely a renewable energy, that it can generated again and again.
It does have certain drawbacks also, because <u>the area may sometime do not experience constant wind, due to which it cannot store energy. So frequent wind blowing areas are the best place to set up windmills</u>.
Thus, the correct answer is option (3)
Answer:
Explanation:
Hello,
Here, by using the Dalton's law, we can quantify the total pressure of a gaseous mixture by knowing the partial pressure of each gas, in case, hydrogen, helium and argon:
In such a way, since we actually know the partial pressure of helium and argon, and the total pressure, we can compute the partial pressure of hydrogen as shown below:
Best regards.
Answer:
The appropriate alternative is option C "".
Explanation:
The given value is:
Energy of photon,
E =
As we know,
h =
Now,
The frequency of the light will be:
⇒
On substituting the given values, we get
⇒
On solving, we get
⇒