Question

difference between atomic mass amd molecular mass ( two points)​

Answer 1

Answer:

The atomic mass corresponds to the mass of an element, while the molecular mass corresponds to the mass of a chemical compound.

Explanation:

Answer 2

Explanation:

What is the difference between molecular mass, atomic mass and molar mass?

Let’s take oxygen, O2, for an example. Examples shall make it easier to understand.

We will use u, kg and g as the units of mass.

The full form of u is Unified atomic mass unit. Commonly people use amu (atomic mass unit) or Da (dalton) as well.

kg is kilogram and g is gram.

1 u = mass of one nucleon (proton/neutron; the constituents of the atomic nucleus).

1 u = 1.66 ×10^−27 kg.

Atomic Mass: An oxygen molecule is constituted of two oxygen atoms. O2 is basically ::O=O::

Atomic mass is the mass of one atom.

The mass of one oxygen atom is (15.9994 ± 0.0004) u or roughly 16 u.

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Molecular Mass: Mass of one molecule of oxygen i.e. of one ‘O2′ molecule (the whole ::O=O:: entity).

So the mass of one molecule of oxygen will be 2 x 16 u = 32 u.

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Molar mass: The mass of one mole of oxygen.

1 mole of oxygen = 6.022 × 10^23 number of oxygen molecules.

Let us try to calculate and see how it goes.

1 molecule of O2 weighs 32 u = 32 x 1.66 ×10^−27 kg

1 mole of oxygen = 6.022 × 10^23 number of oxygen molecules

So 1 mole of oxygen weighs 32 x 1.66 ×10^−27 x 6.022 × 10^23 kg = 0.031988864 kg = 31.988 g = approximately 32 g.

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Note: 1 mole of oxygen consists of a large number of molecules, hence we switched to a bigger unit (from u to g) for convenience.

I hope you get the differences now. Thanks for A2A.