Answer:
<h2>mass = 200.23 g</h2>Explanation:
The density of a substance can be found by using the formula
Since we are finding the mass
<h3>mass = Density × volume</h3>From the question
Density = 0.81 g/mL
volume = 247.2 mL
Substitute the values into the above formula and solve for the mass
mass = 0.81 × 247.2
= 200.232
We have the final answer as
<h3>mass = 200.23 g to 2 decimal places</h3>Hope this helps you
Answer:
As Per Given Information
Number of moles SO₂ ( Sulphur dioxide ) is 0.30
We 've been asked to find the number of atoms in given moles of Sulphur dioxide .
Value of Avogadro Number is 6.022 × 10²³ mol⁻¹
For finding the number of atoms we will use formale
Putting the given value we obtain
So, the number of atoms in sulphur dioxide is 1.8066 × 10²³
The question is incomplete, here is the complete question:
Calculate the pH at 25°C of a 0.39 M solution of sodium hypochlorite NaClO. Note that hypochlorous acid HClO is a weak acid with a pKa of 7.50. Round your answer to 1 decimal place.
<u>Answer:</u> The pH of the solution is 10.4
<u>Explanation:</u>
We are given:
Molarity of sodium hypochlorite = 0.39 M
of HClO = 7.50
We know that:
of HClO =
To calculate the base dissociation constant for the given acid dissociation constant, we use the equation:
where,
= Ionic product of water =
= Acid dissociation constant =
= Base dissociation constant
Putting values in above equation, we get:
The chemical equation for the reaction of hypochlorite ion with water follows:
<u>Initial:</u> 0.39
<u>At eqllm:</u> 0.39-x x x
The expression of for above equation follows:
Putting values in above equation, we get:
Neglecting the negative value of 'x' because concentration cannot be negative
To calculate the pOH of the solution, we use the equation:
We are given:
Putting values in above equation, we get:
To calculate pH of the solution, we use the equation:
Hence, the pH of the solution is 10.4