Question

number of atoms in 112 u of He is​

Answer 1

Answer:

No. of moles = 112/4

=28mol

No. of molecules = 28×6.022×10^23

168.616 × 10^23

No. of atoms = 168.615 × 10^23

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Answer 2

The number of atoms in 112 u of He is​ 28.

How do we find out the number of atoms?

• The mass of any atom is expressed in the atomic mass unit or amu or u.
• The atomic mass of He is 4.
• So the number of atoms becomes = 112/4 = 28.

Atomic mass:

• Atomic mass unit (amu) or just u are used to indicate it.
• A single atom of the carbon-12 isotope has a mass that is exactly one-twelfth (1/12) of an atomic mass unit (1u).
• A mass that is one-twelfth the mass of an atom of carbon-12 is known as an atomic mass unit.
• Any isotope of any element's mass is represented in terms of the carbon-12 reference standard.
• One atom of helium-4, for instance, weighs 4.0026 amu.

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