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asambeis [7]
3 years ago
8

Calculate the number of moles in the 2.00-L volume of air in the lungs of the average person. Note that the air is at 37.0°C (bo

dy temperature) and that the total volume in the lungs is several times the amount inhaled in a typical breath as given in
Chemistry
1 answer:
7nadin3 [17]3 years ago
7 0

Answer:

The number of mole = 0.079 mole.

Explanation:

According to ideal gas equation,

PV = nRT.................... equation 1

Where P = pressure of the air, V = volume of the air, n = number of moles, R = molar gas constant, T = Temperature in (Kelvin), R = molar gas constant

Making n the subject of equation 1

n = PV/RT................... equation 2.

Where P = 101325 pa = 1 atm

V = 2.00 L = 2.00 dm³

T = 37 = 37 + 273 = 310 K, R= 0.082 atm/(dm³Kmol)

Applying these values in equation 1,

n = (2×1)/(310×0.082)

n = 2/25.42

n = 0.079 mole

Therefore the number of mole = 0.079 mole.

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Carbon has a neutral overall charge, an atomic mass of about 12 and an atomic number of 6. How many electrons does carbon have?
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For the atom to be neutral, it must have the same number of electrons and protons. The aromic number indicates the number of protons. Since Carbon has 6 protons, it would have to have 6 electrons for it to be neutral
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A metal M forms the oxide M2O. When 0.890 grams of M reacts with pure oxygen, 0.956 grams of M2O form. Write the balanced equati
Alla [95]

The molar mass of M is  0.225g/mol and the element M is Hydrogen

If a metal M combines with an oxygen element to form the oxide, M_2O then the chemical reaction will be expressed as:

4M + O_2 -> 2M_2O\\

This shows that 4 moles of an unknown element M react with the oxygen element to produce the oxide M_2O

Given the following parameters

Mass of M = 0.890 grams

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Get the molar mass of M:

Molar mass = Mass/number of moles

Molar mass = 0.890/4

Molar mass = 0.225g/mol

Hence the molar mass of M is  0.225g/mol and the element M is Hydrogen

Learn more here: brainly.com/question/6996520

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2 years ago
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What does redshift tell us about the object in the universe?(what is the relationship of the objects?) help me plsss
ki77a [65]

Answer:

Bottom line: A redshift reveals how an object in space (star/planet/galaxy) is moving compared to us. It lets astronomers measure a distance for the most distant (and therefore oldest) objects in our universe.

Explanation:

A redshift reveals how an object is moving in space and enables astronomers to discover otherwise-invisible planets and the movements of galaxies, and to uncover the beginnings of our universe.

They use a property called a "redshift" to describe the motion of an objects moving away from each other in space. Redshift occurs when an object emitting electromagnetic radiation recedes from an observer. The light detected appears "redder" than it should be because it is shifted toward the "red" end of the spectrum.Because the location of spectral features usually shifts to longer wavelengths -- towards the red end of the spectrum -- astronomers refer to this as the redshift of a galaxy. Take a look for yourself at the appearance of some very distant, very fast-moving galaxies in the Hubble Ultra-Deep Field .

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Which of the following has the smallest radius? <br> A. O^2- <br> B. F^- <br> C. Li^- <br> D. Be^2+
nordsb [41]

Answer : The correct option is, (D) Be^{2+}

Explanation :

Effective nuclear charge : It is defined as the attraction of the protons present in the nucleus of an atom to the outermost electrons.

For ions, the effective nuclear charge changes than the neutral atom.

There are two types of ions:

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Anions: They are formed when an atom gain electrons in its outermost shell. They are negative ions.

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Be^{2+}

Hence, the smallest radius of ion is, Be^{2+}

4 0
3 years ago
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