39.8g of a mixture of potassium chloride, KCl, and potassium trioxochlorate(V), KClO3, were heated to a constant mass. If the residue weighed 28.9g, what was the percentage mass of the potassium chloride in the mixture? ( K = 39, Cl = 35.5, O = 16) HINT: KCl is not decomposed on heating.
Your name for KClO3 is not approved by the IUPAC and is incorr
39.8 g = mass KCl + mass KClO3(mass KCl + oxygen)
-28.9 g = mass KCl + mass KCl (oxygen is gone)
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10.9 g = mass oxygen
2KClO3 ==> 2KCl + 3O2
mols O2 = 10.9/32 = approx 0.341
mols KClO3 initially = 0.341 x (2 mols KClO3/3 mols O2) = 0.341 x 2/3) = 0.227 mols KClO3
Then g KClO3 initially = 0.227 x 122.5 = 27.8 g
Then 39.8 g - 27.8 g = 12 g KClO3.
Then % KClO3 = (mass KClO3/39.8)*100 = ?
%KCl initially in the mixture = 100%-%KClO3 = ?
Well well, it's time to solve a chemistry problem! I hope you're ready because I'm about to add a dash of humor to it.
To find the percentage mass of potassium chloride in the mixture, we need to calculate the mass of potassium chloride in the residue and then divide it by the initial mass of the mixture, and finally multiply it by 100. Let's do some math!
We know that the initial mass of the mixture was 39.8g, and the mass of the residue was 28.9g. So, to find the mass of potassium chloride in the residue, we subtract the mass of the residue from the initial mass:
Mass of potassium chloride = Initial mass - Mass of residue
Mass of potassium chloride = 39.8g - 28.9g
Mass of potassium chloride = 10.9g
Now, to find the percentage mass of potassium chloride, we divide the mass of potassium chloride by the initial mass of the mixture, and then multiply by 100:
Percentage mass of potassium chloride = (Mass of potassium chloride / Initial mass) * 100
Percentage mass of potassium chloride = (10.9g / 39.8g) * 100
Percentage mass of potassium chloride = 27.4%
So, the percentage mass of potassium chloride in the mixture is approximately 27.4%. Ta-da!
To find the percentage mass of potassium chloride in the mixture, we need to calculate the mass of potassium chloride and divide it by the total mass of the residue.
Given:
Mass of mixture = 39.8g
Mass of residue = 28.9g
To determine the mass of potassium chloride in the mixture, we need to subtract the mass of the residue from the mass of the mixture:
Mass of potassium chloride = Mass of mixture - Mass of residue
= 39.8g - 28.9g
= 10.9g
The percentage mass of potassium chloride can be calculated as follows:
Percentage mass of potassium chloride = (Mass of potassium chloride / Mass of residue) x 100
= (10.9g / 28.9g) x 100
≈ 37.72%
Therefore, the percentage mass of the potassium chloride in the mixture is approximately 37.72%.
To find the percentage mass of potassium chloride in the mixture, we need to determine the masses of potassium chloride (KCl) and potassium trioxochlorate(V) (KClO3) in the mixture.
First, let's calculate the mass of potassium chloride in the mixture.
Since KCl is not decomposed on heating, the mass of KCl remains constant throughout the process.
Therefore, the mass of KCl in the residue is also 28.9g.
Next, we need to find the mass of potassium trioxochlorate(V) (KClO3) in the mixture.
Since we started with 39.8g of the mixture and the residue weighs 28.9g, we can subtract the mass of KCl from the starting mass of the mixture to get the mass of KClO3:
Mass of KClO3 = Starting mass of mixture - Mass of KCl
Mass of KClO3 = 39.8g - 28.9g = 10.9g
Now, we can calculate the percentage mass of potassium chloride in the mixture by using the formula:
Percentage mass of KCl = (Mass of KCl / Total mass of mixture) x 100
Plug in the values we have:
Percentage mass of KCl = (28.9g / 39.8g) x 100
Percentage mass of KCl = 0.726 x 100
Percentage mass of KCl = 72.6 %
Therefore, the percentage mass of potassium chloride in the mixture is 72.6%.