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Wewaii [24]
3 years ago
11

What volume in dm3 of KCl is obtained in the following equation ??

Chemistry
2 answers:
jeka57 [31]3 years ago
7 0
The method is:

1) Calculate the grams of KCl produced.

   - you need to know the starting quantity of reactant KClO3, which usually is in grams.
   - convert the grams to moles, by dividing by the molar mass of the KClO3
   - use the ratio 2 moles of KClO3 produces 2 moles of KCl
   - convert the moles of KCl to grams, by multiplying by the molar mass of KCl

2) Given that the product is in solid state (which is weird), you will need to use the apparent density of the KCl, which is a datum that you have to search in tables.

It would be more logical to ask for the volume of O2 which is in gas state. If this were the case, you should know, the temperature, and the pressure, to use solve for V from the ideal gas equation: pV = nRT => V = nRT/p

n: number of moles produced of the gas (using the ratio 2 moles of KClO3 produces 2 moles of O2)

T: temperature in kelvin
p: pressure
R: Universal constant of gases
V: volume of O2.

Ivan3 years ago
3 0

Answer: Volume of KCl is 0.0752dm^3

Explanation: For the given reaction,

2KClO_3(s)\rightarrow 2KCl(s)+3O_2(g)

We can see that 2 moles of KClO_3 is giving 2 moles of KCl. So, the number of moles of KCl will be 2.

Mass of KCl can be calculated by,

\text{Number of Moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Molar mass of KCl = 74.5 g/mol.

Number of Moles = 2

\text{Given mass}= Moles\times \text{Molar Mass}

Given mass = 149g

Now, to calculate the Volume of KCl, we will use the density formula,

\rho =\frac{Mass}{Volume}

\text{Specific density of KCl}(\rho)=1.98g/cm^{3}

Mass = 149g (Calculated above)

Putting the values in density formula, we get

1.98g/cm^3=\frac{149g}{Volume}

\text{Volume of KCl}=75.252cm^3

Conversion Factor: 1cm^3=10^{-3}dm^3

Volume of KCl in dm^3=0.0752dm^3

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In a titration of 47.41 mL of 0.3764 M ammonia with 0.3838 M aqueous nitric acid, what is the pH of the solution when 47.41 mL +
Volgvan

<u>Answer:</u> The pH of the solution is 1.136

<u>Explanation:</u>

To calculate the moles from molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

  • <u>For ammonia:</u>

Molarity of ammonia = 0.3764 M

Volume of ammonia = 47.41 mL = 0.04741 L   (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

0.3764mol/L=\frac{\text{Moles of ammonia}}{0.04741L}\\\\\text{Moles of ammonia}=0.01784mol

  • <u>For nitric acid:</u>

Molarity of nitric acid = 0.3838 M

Volume of ammonia = (47.41 + 10.00) mL = 57.41 mL= 0.05741 L

Putting values in above equation, we get:

0.3838mol/L=\frac{\text{Moles of nitric acid}}{0.05741L}\\\\\text{Moles of nitric acid}=0.02203mol

After the completion of reaction, amount of nitric acid remained = 0.022 - 0.0178 = 0.0042 mol

For the reaction of ammonia with nitric acid, the equation follows:

                       NH_3+HNO_3\rightarrow NH_4NO_3

At t=0             0.0178   0.022

Completion        0     0.0042        0.0178

As, the solution of the reaction is made from strong acid which is nitric acid and the conjugate acid of weak base which is ammonia. So, the pH of the reaction will be based totally on the concentration of nitric acid.

To calculate the pH of the reaction, we use the equation:

pH=-\log[H^+]

where,

[H^+]=\frac{0.0042mol}{0.05741L}=0.0731M

Putting values in above equation, we get:

pH=-\log(0.0731)\\\\pH=1.136

Hence, the pH of the solution is 1.136

8 0
3 years ago
You have a solution of 600 mg of caffeine dissolved in 100 mL of water. The partition coefficient for aqueous caffeine extracted
klio [65]

Answer:

159 mg caffeine is being extracted in 60 mL dichloromethane

Explanation:

Given that:

mass of caffeine in 100 mL of water =  600 mg

Volume of the water = 100 mL

Partition co-efficient (K) = 4.6

mass of caffeine extracted = ??? (unknown)

The portion of the DCM = 60 mL

Partial co-efficient (K) = \frac{C_1}{C_2}

where; C_1= solubility of compound in the organic solvent and C_2 = solubility in aqueous water.

So; we can represent our data as:

K=(\frac{A_{(g)}}{60mL} ) ÷ (\frac{B_{(mg)}}{100mL} )

Since one part of the portion is A and the other part is B

A+B = 60 mL

A+B = 0.60

A= 0.60 - B

4.6=(\frac{0.6-B(mg)}{60mL} ) ÷ (\frac{B_{(mg)}}{100mL})

4.6 = \frac{(\frac{0.6-B(mg)}{60mL} )}{(\frac{B_{(mg)}}{100mL})}

4.6 × (\frac{B_{(mg)}}{100mL}) = (\frac{0.6-B(mg)}{60mL} )

4.6 B *\frac{60}{100} = 0.6 - B

2.76 B = 0.6 - B

2.76 + B = 0.6

3.76 B = 0.6

B = \frac{0.6}{3.76}

B = 0.159 g

B = 159 mg

∴ 159 mg caffeine is being extracted from the 100 mL of water containing 600 mg of caffeine with one portion of in 60 mL dichloromethane.

4 0
2 years ago
Read 2 more answers
Why does mass of popcorn stay the same after popping it
Varvara68 [4.7K]

Answer:

Explanation:

it stays the same because the seeds or whatever in the bag was still the pop corn just not fully devloped

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3 years ago
Which of these is an isoelectronic series? question 7 options: 1) na+, k+, rb+, cs+ 2) k+, ca2+, ar, s2– 3) na+, mg2+, s2–, cl–
-BARSIC- [3]
An isoelectronic series is where all of the ions listed have the same number of electrons in their atoms. When an atom has net charge of zero or neutral, it has equal number of protons and electrons. Hence, it means that the atomic number = no. of protons = no. of electrons. If these atoms become ions, they gain a net charge of + or -. Positive ions are cations. This means that they readily GIVE UP electrons, whereas negative ions (anions) readily ACCEPT electrons. So, to know which of these are isoelectronic, let's establish first the number of electron in a neutral atom from the periodic table:

Na=11; K=19; Rb=37; Cs = 55; Ca=20; S=16; Mg=12; Li=3; Be=4; B=5; C=6, Ar = 18

A. Na⁺: 11-1 = 10 electrons
     K⁺: 19 - 1 = 18 electrons
     Rb⁺: 37-1 = 36 electrons

B. K⁺: 19 - 1 = 18 electrons
    Ca²⁺: 20 - 2 = 18 electrons
    Ar:  18 electrons
    S²⁻:  16 +2 = 18 electrons

C. Na⁺: 11-1 = 10 electrons
    Mg²⁺: 12 - 2 = 10 electrons
     S²⁻:  16 +2 = 18 electrons

D. Li=3 electrons
    Be=4 electrons
    B=5 electrons
    C=6 electrons

The answer is letter B.
6 0
3 years ago
********WORTH 25 POINTS******What are 3 examples of Chemical weathering?
Scrat [10]

Answer:

Carbonation. When you think of carbonation, think carbon

Oxidation. Oxygen causes oxidation.

Hydration. This isn't the hydration used in your body, but it's similar.

Explanation:

5 0
3 years ago
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