What is the minimum pressure in kPa that must be applied at 25 °C to obtain pure water by reverse osmosis from water that is 0.227 M in sodium chloride and 0.078 M in magnesium sulfate? Assume complete dissociation for electrolytes.

Answers

Answer 1
Answer: What we need to know is the molarity of all the particles of NaCl taking into account that NaCl = Na+ + Cl- and the ones of taking into account that MgSO4=Mg+2 + SO4-2. we are going to use a formula to get the molarity like this: M = 2(0.227 M) + 2(0.078 M) 
        M = 0.61 M 
After that to get the atm we do it like this:
Π = (0.61 M)(0.08206 atm-L/mol-K)(25 + 273 K) 
Π = 14.9 atm  
and then we do this multyplication
(14.9 atm)(101.3 kPa/atm) = 1509.37 kPa


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What does Nb stand for on the periodic table? Pls help! Need aware soon

Answers

it stands for niobium which was discovered in 1801 by Charles Hatchett of Brittan. It is ussed in welding rods, air fraim systems, superconductive magnets. It gets its name from iobe, the daughter of King Tantalus of the Greek myth. Niobium was considered identical to Tantalum, named after Tantalus, until 1884. Resists corrosin due to an oxide film. It is used in aviation industry
it stands for niobium 

What is the volume 0.0023 moles of CO2

Answers

1 mole ---------------- 22.4 ( at STP )
0.0023 moles -------- ?

v = 0.0023 * 22.4 / 1

v = 0.05152 L

hope this helps!

Final answer:

In order to calculate the volume of 0.0023 moles of CO2, we use the ideal gas law and understand that one mole of an ideal gas at standard temperature and pressure occupies a volume of 22.4 liters. The volume for 0.0023 moles of CO2 is found to be approximately 0.05152 liters.

Explanation:

To solve for the volume of the 0.0023 moles of CO2, we need to use the ideal gas law, PV=nRT, where P depicts the pressure, V signifies the volume we need to find, n equals the number of moles, R denotes the universal gas constant, and T denotes the temperature. Assuming the relationship takes place at standard temperature and pressure (STP, 0 degrees Celsius, 1 atm), we can solve for V.

At STP, 1 mole of any ideal gas occupies a volume of 22.4 liters. Therefore, V = n * (Volume of 1 mole at STP), which equals 0.0023 moles * 22.4 L/mole = 0.05152 liters.

Learn more about Volume of Moles here:

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What are some of the limitations of forensic drug chemistry?

Answers

Thelimitations of forensic drug chemistry is (1) they cannot create drugs out ofwht they learned in chemistry although they can create one, (2) theire line of expertiseis limited to the illegal drugs and crime committed acts.

They know how to identify the drugs found at crime scenes.

The amplitude of a transversal wave in a spring toy triples. What happens to the energy of the wave in thetoy?

Answers

Answer: The energy of the wave increases by a factor of 9

Explanation:

3 x 3 = 9

Substance A is mixed with water and donates 0.4% of its H+ ions. Which of the following BEST describes Substance A?A.
It is a strong base and a very poor conductor of electric current.

B.
It is a strong acid and a very good conductor of electric current.

C.
It is a weak base and a very good conductor of electric current.

D.
It is a weak acid and a poor conductor of electric current.

Answers

Substance A is mixed with water and donates 0.4% of its H⁺ ions, therefore given substance is a weak acid & show poor conduction of electric current.

What are acids?

According to the Arrhenius theory of acids and bases, acids are those species which gives H⁺ ion to the solution.

In the question it is given that, substance A is mixed with water and it donates H⁺ ion, from this it is clear that given substance is acid. It is also mention that it donates only 0.4% of its H⁺ ion means partial dissociation is observed, so we conclude that this acid is weak in nature. And due to weak dissociation and less number of available H⁺ ion it did not conduct electricity effectively.

Hence, option (D) is correct i.e. it is weak acid and a poor conductor of electric current.

To know more about acids, visit the below link:

brainly.com/question/12916250

Answer:

D

Explanation:

List four properties of a candle

Answers

  1. Physical properties 
. Its soft 
. Its moldable 
. Its white/translucent without color added 
. Its insoluble in water 
. its soluble in benzene and ether 
. it melts around 120 degrees farenheit 

2. Chemical properties 
. It is a hydrocarbon with around 25 carbon atoms 
. it reacts with oxygen to form water vapor and CO2 
. its nonpolar (not sure if thats physical or chemical)