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Mazyrski [523]
3 years ago
15

What is the molarity of a solution containing 5 moles of solute in 250 milliliters of solution?

Chemistry
2 answers:
ivolga24 [154]3 years ago
6 0
M=mol/L
= 5/.25
=20
aliya0001 [1]3 years ago
6 0

<u>Answer:</u> The molarity of a solution is 20 M

<u>Explanation:</u>

Molarity is defined as the number of moles present in one liter of solution.

Mathematically,

\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}

We are given:

Moles of solute = 5 moles

Volume of solution = 250 mL

Putting values in above equation, we get:

\text{Molarity of solution}=\frac{5\times 1000}{250}=20M

Hence, the molarity of a solution is 20 M

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Calculate the acid dissociation constant Ka of a 0.2 M solution of weak acid that is 0.1% ionized is ________.
mars1129 [50]

Answer: acid dissociation constant Ka= 2.00×10^-7

Explanation:

For the reaction

HA + H20. ----> H3O+ A-

Initially: C. 0. 0

After : C-Cx. Cx. Cx

Ka= [H3O+][A-]/[HA]

Ka= Cx × Cx/C-Cx

Ka= C²X²/C(1-x)

Ka= Cx²/1-x

Where x is degree of dissociation = 0.1% = 0.001 and c is the concentration =0.2

Ka= 0.2(0.001²)/(1-0.001)

Ka= 2.00×10^-7

Therefore the dissociation constant is

2.00×10^-7

7 0
3 years ago
Which of the following is an electrolyte?<br><br> a. PbCl2<br> b. MgS<br> c. HNO3<br> d. Al2(Cr2O7)3
Phoenix [80]

Answer: A: PbCl2

Hope dis helps!

8 0
3 years ago
The bowling ball is whizzing down the bowling lane at 4 m/s. If the mass of the bowling ball is 7 kg, what is its kinetic energy
natali 33 [55]
KE = (1/2)(m)(v^2)

KE = (1/2)(7)(4^2)

KE = (1/2)(112)

KE = 56 J
4 0
3 years ago
A mixture of CO2 and Kr weighs 41.0 g and exerts a pressure of 0.729 atm in its container. Since Kr is expensive, you wish to re
Elena-2011 [213]

Answer:

a) 24.31 g

b) 16.69 g

Explanation:

A mixture of CO2 and Kr weighs 41.0 g and exerts a pressure of 0.729 atm in its container.

After the CO2 is completely removed by absorption with NaOH(s), the pressure in the container is 0.193 atm.

Therefore, Pressure of Kr = 0.193 atm

Pressure of CO2  = 0.729 - 0.193 = 0.536 atm

Their mole fraction can be also determined as follows:

CO2 = \frac{Presssure due to CO_2}{Total pressure}

CO2 = \frac{0.536}{0.729}

= 0.735

Also; for Kr ; we have

Kr = \frac{0.193}{0.729}

Kr = 0.265

Molar mass of CO2 = 44 g/mol

Molar mass of Kr = 83.78 g/mol

Mass of CO2 = mole fraction * molar mass = 0.735 * 44 = 32.34

Mass of Kr = 0.265 *  83.78 = 22.20

Total mass = 32.34 +22.20 = 54.54

The Percentage of gas in mixture is  as follows:

% CO2 = \frac{32.34}{54.54}* 100 %

= 0.5930

= 59.30%  

(a) Mass of CO2 in mixture = 0.5930* 41 g = 24.31 g

% Kr =\frac{22.20}{ 54.54} * 100 %

= 0.407

= 40.70 %

(b) Mass of Kr in mixture = 0.407 * 41 = 16.69 g

4 0
3 years ago
Which solution contains the biggest amount of chloride ions?
Katen [24]

Answer:

the quantity of solution to moles for d is significantly lower.

Explanation:

the larger the amount of liquid, the less amount of ions to dissociate hence having a lesser amount of chloride ions.

compared to b which is less liquid and a higher concentration

4 0
3 years ago
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