Hey! i tried to work out the question in the clearest way I could. i hope this helps!! feel free to follow up if you have any more questions!!
Answer:
Given: 800g S02 Unknown: ?g S
Explanation:
Problem Type: mass - mass
(I've done this before and my teacher gave that answer)
Answer:
The molarity is 3.42
Explanation:
The molarity reflects the concentration of a solution and indicates the number of moles of solute per liter of solution. In other words, the molarity (M) is the number of moles of solute that are dissolved in a given volume.
The Molarity of a solution is determined by the following formula:
Molarity is expressed in units ().
To know the amount of moles of solute (NaCl) you must know its molar mass. If:
- Na: 23 g/mole
- Cl: 35.45 g/mole
the molar mass of NaCl is: 23 g/mole + 35.45 g/mole= 58.45 g/mole
Now you apply a rule of three as follows: if 58.45 g of NaCl are present in 1 mole, 10 grams of the compound in how many moles are they?
moles= 0.171
Then:
- number of moles of solute: 0.171 moles
- volume= 50 mL= 0.05 L (being 1 L=1000 mL)
Replacing in the definition of molarity:
Molarity= 3.42
<u><em>The molarity is 3.42 </em></u><u><em></em></u>
Answer:
<h2>0.4 moles</h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
We have the final answer as
<h3>0.4 moles</h3>
Hope this helps you
Answer:
Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6
Bromocresol green, color change from pH = 4.0 to 5.6
Explanation:
The equation for the reaction is :
concentration of = 10%
10 g of in 100 ml solution
molar mass = 45.08 g/mol
number of moles = 10 / 45.08
= 0.222 mol
Molarity of
= 2.22 M
number of moles of in 20 mL can be determined as:
Concentration of
= 2.22 M
Similarly, The pKa Value of is given as 10.75
pKb value will be: 14 - pKa
= 14 - 10.75
= 3.25
the pH value at equivalence point is,
Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6