There are 2.04.10²² atom in a pure copper penny that weighs 2.15 g
Further explanation
Atoms are composed of 3 types of basic particles namely protons, electrons, and neutrons
The mass of this basic particle is expressed in units of atomic mass
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
So the atomic mass obtained is the mass of the atom relative to the 12th carbon atom
Mass atom X = mass isotope 1 . % + mass isotope 2.%
An atomic mass unit = amu is a relative atomic mass of 1/12 the mass of an atom of carbon-12.
The 'amu' unit has now been replaced with a unit of 'u' only
This atomic unit uses the standard atomic mass, that is, the C-12 isotope
1 atom C-12 = 12 atomic mass units
1 atomic mass unit = 1/12 x mass 1 C-12 atom
1 unit of atomic mass = 1.66.10⁻²⁴ grams
the mass of each basic particle in atomic mass units is:
electron mass = 9.11.10⁻²⁸ grams
proton mass = 1.6726.10⁻²⁴ grams
neutron mass = 1,675.10⁻²⁴ grams
The proton mass is considered to be equal to 1 atomic mass unit and a neutron which is also considered to be equal to 1 atomic mass unit
A pure copper penny have weighs 2.15 g
And atomic mass of Copper = 63.5 amu
Then :
Mass in grams = 63.5 x 1.66.10⁻²⁴
mass in grams = 105.41 .10⁻²⁴ grams
With 2.15 grams ,
The total atoms becomes : 2.15 grams : 105.41 .10⁻²⁴
total atoms : 2.04.10²²
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Keywords: mass number, atomic mass, amu, isotope
