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Aleks04 [339]
3 years ago
6

A rarefraction is generated when particles move A:together B.closer C.under D.apart

Chemistry
1 answer:
elena55 [62]3 years ago
4 0
The answer is D, apart
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What mass of potassium hypochlorite (FW-90.6 g/mol) must be added to 4.50 x 10 mL of water to give a solution with pH 10.20? [Ka
marta [7]

Answer : The mass of potassium hypochlorite is, 4.1 grams.

Explanation : Given,

pH = 10.20

Volume of water = 4.50\times 10^2ml=0.45L

The decomposition of KClO  will be :

KClO\rightarrow K^++ClO^-

Now the further reaction with water (H_2O) to give,

ClO^-+H_2O\rightarrow HClO+OH^-

First we have to calculate the pOH.

pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-10.20=3.8

Now we have to calculate the OH^- concentration.

pOH=-\log [OH^-]

3.8=-\log [OH^-]

[OH^-]=1.58\times 10^{-4}M

Now we have to calculate the base dissociation constant.

Formula used : K_b=\frac{K_w}{K_a}

Now put all the given values in this formula, we get :

K_b=\frac{1.0\times 10^{-14}}{4.0\times 10^{-8}}=2.5\times 10^{-7}

Now we have to calculate the concentration of ClO^-.

The equilibrium constant expression of the reaction  is:

K_b=\frac{[OH^-][HClO]}{[ClO^-]}

As we know that, [OH^-]=[HClO]=1.58\times 10^{-4}M

2.5\times 10^{-7}=\frac{(1.58\times 10^{-4})^2}{[ClO^-]}

[ClO^-]=0.0999M

Now we have to calculate the moles of ClO^-.

\text{Moles of }ClO^-=\text{Molarity of }ClO^-\times \text{Volume of solution}

\text{Moles of }ClO^-=0.0999mole/L\times 0.45L=0.0449mole

As we know that, the number of moles of ClO^- are equal to the number of moles of KClO.

So, the number of moles of KClO = 0.0449 mole

Now we have to calculate the mass of KClO.

\text{Mass of }KClO=\text{Moles of }KClO\times \text{Molar mass of }KClO

\text{Mass of }KClO=0.0449mole\times 90.6g/mole=4.07g\approx 4.1g

Therefore, the mass of potassium hypochlorite is, 4.1 grams.

6 0
3 years ago
Someone please help me figure out the significant figure
Neporo4naja [7]
I believe the answer is 15kg since after that there is 16kg and before there is 14kg
4 0
11 months ago
2000 joules are required to heat 125 grams of an unknown substance from 10 c to 28 c. What is the specific heat of the substance
Delicious77 [7]
Hello! Specific heat is the amount of energy required by known amount of substance to raise its temperature by one degree celsius. In our question it is given that 2000J energy when supplied to 125 g of unknown substance raised its temperature by 18 oC. So, The specific heat is calculated as follow;

3 0
3 years ago
1. The term _________<br> refers to the chemical potential of hydrogen.
docker41 [41]

Answer:

PH

Explanation:

7 0
3 years ago
Read 2 more answers
Why is it not correct/precise to say "a molecule of salt?"
Fynjy0 [20]

It is not correct to say " a molecule of salt " because salt is a compound.

Explanation:

  • As we know a molecular bond is present in each molecule.
  • Salt (NaCl) is considered as a compound because it is made up of two types of elements that are sodium as well as chlorine.
  • On the other hand it is not considered as a molecule as it is not holding an ionic bond.
  • As a result we can name it as an ionic compound. Hence it is not considered as a molecule of salt.
4 0
3 years ago
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