Answer:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Explanation:
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Calculate the concentration of all species in a 0.12 M KF solution Ka(HF)=6.3×10⁻⁴ is 0.00002723
The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution
Here given data is first write the balanced equilibrium equation
HF ↔ H⁺ + F⁻
Therefore the mole ratio is: 1 HF: 1 H⁺ : 1 F⁻
Hence Ka = [H⁺] [H⁺] / [HF] = [H⁺]² / [HF]
From the KF value you can calculate the H⁺
H⁺ = 10⁻⁰.¹² = 1.31
Now substitute this value in the Ka in the equation of ka
Ka = [H⁺]² / [HF] ⇒ [HF] = [H⁺]² / Ka = (1.31)²/6.3×10⁻⁴ = 0.00002723
There fore the concentration of all species is 0.00002723
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