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3 years ago

What principal quantum number refers to:

1 answer:

4 0

The principle quantum number "n" represents the relative overall energy of each orbital, and the energy of each orbital increases as the distance from the nucleus increases. The sets of orbitals with the same "n" value are often referred to as electron shells or energy levels.

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A permeation membrane separates an inlet air stream, F, (79 mol% N2, 21 mol% O2), into a permeate stream, M, and a reject stream

Norma-Jean [14]

Answer:

Permeate stream: M=10,47 L/min
Reject stream: J=38,24 L/min

Explanation:

Using the law of mass conservation, we have that the moles of any component in the inlet air stream equals the moles of this compenent in the two outlets stream. Being A the mole flowrate for the permeate stream and B the mole flowrate for the reject stream (both in mol/min), we have equation (1) and (2):

Oxygen:

2 mol/min * 0,21 = A mol/min * 0,50 + B mol/min * 0,13 ......................(1)

0,42 = 0,5A + 0,13B...........................(1)

Nitrogen:

2 mol/min * 0,79 = A mol/min * 0,50 + B mol/min * 0,87 ......................(2)

1,58 = 0,5A + 0,87B...........................(2)

Solving this system:

1,58 = 0,5A + 0,87B...........................(2)

0,42 = 0,5A + 0,13B...........................(1)

1,16 = 0A + 0,74B...............................(2) - (1)

1.16=0,74B

1,16/0,74=B

B=1,57 mol/min

And now replacing B in equation (1):

1,58 = 0,5A + 0,87*1,57

1,58-1,37=0,5A

0,21/0,5=A

A=0,43 mol/min

To calculate the volumetric flowrate of the permeate stream (M) and the reject stream (J), we just replace the given and calculate data into the ideal gas equation:

PV=nRT,.................... V = nRT/P

Permeate stream:

$M= \frac{0,43 \frac{mol}{min}*8,314\frac{m3Pa}{molK}*293K }{0,1 MPa*\frac{10^{6}Pa }{1 MPa} }=0,01047\frac{m^{3} }{min} * \frac{1000 L}{1 m^{3} }=10,47 L/min$

Rejct stream:

$J= \frac{1,57 \frac{mol}{min}*8,314\frac{m3Pa}{molK}*293K }{0,1 MPa*\frac{10^{6}Pa }{1 MPa} }=0,0382\frac{m^{3} }{min} * \frac{1000 L}{1 m^{3} }=38,24 L/min$

6 0

3 years ago

Which has a higher mass percent of magnesium mgo or mg3n2?

vampirchik [111]

The compound that has higher mass percent is Mg3N2 which is 72%

explanation
calculate the % mass of Mg in each compound

% composition of mg= molar mass of Mg/ total molar mass of the compound x100

in MgO = 24 /40 x100 = 60%

in Mg3N2 =72/100 x100 = 72 %

therefore the % composition in Mg3N2 is higher

6 0

3 years ago

Which substance cannot be decomposed by a chemical change?

coldgirl [10]

Copper substance cannot be decomposed by a chemical change.

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When heated, the copper to carbonate breaks down into copper to oxide. The copper carbonate, which is dark in colour, releases carbon dioxide as well.Because they are the simplest chemically, elements cannot be broken down by chemical processes.

Elements are those pure compounds that cannot be broken down by reactions, heating, electrolysis, or other common chemical processes. Examples of elements are oxygen, gold, and silver. Its makeup stays the same, though. One instance of a physical change is melting. A physical change is when a sample of matter experiences a change in some of its qualities but not in its identity. Water turns into water vapour when it is heated.

Learn more about copper here:

brainly.com/question/493292

#SPJ4

6 0

2 years ago

What is science?

Vladimir79 [104]

Hi! Science stands for “Systematic Comprehensive Investigation and Exploration of Nature Causes and Effects”.

What is science?

Science is the systematic study of the structure and behavior of the physical natural world. It is also use for experience or can say it is an experience. Scientists are people who test science/experiments for the worlds. Science really is just the study of the nature. Science use math em empathic and logic, which are sometimes called “formal science”.

4 0

3 years ago

Read 2 more answers

Which of these is an element?

Brilliant_brown [7]

Answer:

Carbon is the only element.

8 0

3 years ago

Read 2 more answers