Courses
Courses for Kids
Free study material
Offline Centres
More
Store

# The number of atoms of the $He$ in $104$ $amu$is:A. $3.1 \times {10^{25}}$B. $6.2 \times {10^{25}}$C. $26$D. $206$

Last updated date: 10th Sep 2024
Total views: 428.7k
Views today: 4.28k
Verified
428.7k+ views
Hint: Here in the question the abbreviation used $amu$ stands for the atomic mass unit. Every element is having some of its unique atomic mass unit. The atomic mass unit of the helium $He$ atom is four (4) atomic mass units.

So, the atomic mass unit of the helium atom= $4$ $amu$
This implies that the $4$ $amu$ of helium = 1 atom of the helium atom
So, the number of the atoms in the $104$ $amu$= $\dfrac{{104}}{4} = 26$
Hence, The number of atoms of the $He$ in $104$ $amu$ is $26$.
An atomic mass unit which is represented as a symbol in AMU or amu form. It is defined as precisely $\dfrac{1}{{12}}th$ the mass of an atom of Carbon-12. The Carbon-12 atom has six protons and six neutrons in its nucleus. In other words, one AMU is the average of the proton rest mass and the neutron rest mass. That means the mass of an atom in AMU is roughly equal to the sum of the number of protons and neutrons in the nucleus. The AMU is used to express the relative masses of, and thereby differentiate between, various isotopes of elements. Sometimes there is a confusion between the concept of the molar mass and the atomic mass unit. Molar mass is the mass of one mole of a substance. Atomic mass is the mass of one individual unit of a substance. the atomic mass in amu of a substance is numerically equivalent to the mass in g of one mole of that substance.