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Number of atoms of He in 100 u of He (atom mass He is 4u) . Options: 1- 25, 2- 50, 3- 100 4- 400

Posted by Kajal Verma 3 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Dεερακ Ȿιηɠꜧ 3 years, 11 months ago

0Thank You

Gaurav Seth 3 years, 11 months ago

The number of atoms present in 100 amu of helium is 25 atoms.

To find:

Number of atoms = ?

Solution:

The number of atoms present in 100 amu of helium is to be calculated by using simple unitary method knowing that the a.m.u. is the atomic mass unit which itself represent the mass.

So thereby, we need to know the "mass of one atom" and that can be divided to know the "number of atoms".

Therefore,

The "mass of one atom" of helium is known to be 4 a.m.u.

Thereby,

1Thank You

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