Mass of Atoms Calculator:
Enter the values of number of atoms, a and the atomic mass, am(g) to determine the value of Mass of atoms, M(g).
Mass of Atoms Formula:
The mass of an atom is a fundamental property that defines the amount of matter present in an atomic particle. It is primarily determined by the total mass of its protons, neutrons, and electrons, with the majority of the mass coming from protons and neutrons, as electrons contribute negligibly. The atomic mass is often expressed in atomic mass units (amu), where 1 amu is approximately equal to 1.66054 * 10-24g.
Atoms of different elements have varying atomic masses due to differences in their subatomic particles. The standard reference for atomic mass is the carbon-12 isotope, which is assigned a mass of exactly 12 amu. The atomic mass of an element can be found on the periodic table as the weighted average of the masses of its isotopes, considering their natural abundances.
The mass of an atom is crucial in chemistry and physics as it helps determine the behaviour of substances in reactions, molecular structures, and the physical properties of elements. It is also used to calculate molar masses, which are essential in stoichiometric calculations.
Mass of atoms, M(g) in grams, equals the product of the number of atoms, a and the atomic mass, am(g) in grams per atom.
Mass of atoms, M(g) = a * am(g)
M(g) = mass of atoms in grams, g.
a = number of atoms.
am(g) = atomic mass in grams per atom, g.
Mass of Atoms Calculation:
- Calculate the mass of 3.0 * 1023 atoms of oxygen (atomic mass = 16 amu).
Given: a = 3.0 * 1023 atoms, am(g) = 16amu = 16 * 1.66054 * 10-24g.
Mass of atoms, M(g) = a * am(g)
M(g) = (3.0 * 1023) * (16 * 1.66054 * 10-24)
M(g) = 7.97g.
- A sample of a pure element has a mass of 10 g. If each atom has an atomic mass of 27 amu, calculate the number of atoms present.
Given: M(g) = 10g, am(g) = 27amu = 27 * 1.66054 * 10-24g.
Mass of atoms, M(g) = a * am(g)
a = M(g) / am(g)
a = 10 / 27 * 1.66054 * 10-24
a = 2.24 * 1023atoms.