Answer:
The mass percentage is 63.3%
Explanation:
First we need to know how much of the AgNO3 we are using to precipitate the chloride, for this we use:
(37.2 ml * 0.1 M)/1000 ml = 0.00372 moles of AgNO3 which means 0.00372 moles of silver.
the relation between Ag and Cl in the precipitation is 1:1, so we can determine that in our sample we have 0.00372 moles of Cl- and in grams we have 131 mg.
Now we need to know how much of the Douglasite is actually chloride. For that we calculate the molar mass:
Mr = 2*39 + 4*35.45 + 55.85 + 2*18 = 311.65 g/mole
Of that 311.65 grams, 141.8 are Cl. So we could calculate how much of the sample is actual Douglasite:
141.8 g Cl --> 311.65 g Douglasite
0.131 g Cl --> x = 0.288 g douglasite.
The sample is 0.455 and represents 100 %
Then, the 288 mg of douglasite is the 63.3 %
An organic compound that contains a carbonyl group with a cell wall. They are only found in plants and bacteria
Answer:
A
Explanation:
always more reactants than products
The solution before dilution and after dilution contains same number of moles, and water is added for dilution.
Option B
<h3><u>Explanation:</u></h3>
Suppose before dilution, the solution contains x moles of KCl in Y liter of water. Now as the concentration got halved, then the solution contains x moles of KCl in 2Y kiters of solution. So the number of moles of KCl in the solution remained constant.
Again, as the solution is diluted to half of the concentration, water must have been added with the solution to make it dilute.
Answer:
A push or pull is referred to as a force. Forces can cause objects to move, slow, stop, or change the direction in which they travel. The force of gravity, for example, pulls all objects toward the Earth's center. Every time two things interact, a force is exerted on each of them. When this happens, the two items no longer feel the force after the interaction ends.
