Chemistry, asked by Anonymous, 4 months ago

question 1 :-

What is Molecular mass ?

question 2 :-

Calculate the molecular mass of oxygen ?


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Answers

Answered by Anonymous
4

Answer:

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1) Molecular mass of a substance is defined as the sum o the atomic masses of all the atoms present in a molecule of a substance. Therefore the relative mass of a molecule is expressed as atomic mass units (amu).

Let us calculate the molecular mass of H2O. we will find it out by following process.

We know the atomic mass of hydrogen is 1u and that of oxygen is 16u.

Molecular mass of H2O containing two hydrogen atoms and single oxygen atom is

2 X 1 + 1 X 16 = 18u

Explanation:

2)The molecular mass of an element is defined as the sum of the masses of the elements present in the molecule. Molecular mass is obtained by multiplying the atomic mass of an element with the number of atoms in the molecule and then adding the masses of all the elements in the molecule.

O2 is a diatomic molecule.

The mass of an oxygen atom = 16 amu.

∴ Mass of O2 molecule = 2 × 16 = 32 amu.

Mass of one molecule of oxygen

⇒ 32/ Avogadro constant ( 6.023 × 1023)

⇒ 5.31 × 10-23g.


Anonymous: What is the meaning of amu here ?
Anonymous: Atomic Mass Units
Definition - AMU. Atomic Mass Units (amu): a mass exactly equal to one-twelfth mass of carbon-12 atom.
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Answered by SUNNY90850
3

Question 1

What is Molecular mass?

Answer The molecular mass is the mass of a given molecule: it is measured in daltons. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.

Question2

Calculate the molecular mass of oxygen ?

Answer 15.999u


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Anonymous: Nice explaination of definenation :)
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