Question

question 1 :-

What is Molecular mass ?

question 2 :-

Calculate the molecular mass of oxygen ?


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Answer 1

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.

Answer 2

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.

Question⇒2

Calculate the molecular mass of oxygen ?

Answer⇒ 15.999u