Question

How many atoms are $3.5$ moles of arsenic atoms?

Answer 1

Arsenic is a chemical element with the symbol AS and atomic number $33.$ Arsenic has molecular weight of $74.92164$ . The mole is the unit of measurement for the amount of substance in the international system of units. It is defined as exactly $6.022\times {{10}^{23}}$ particles, which may be atoms, molecules and ions as electrons.

Complete step by step answer:
According to the question we have given data as $3.5$ moles of arsenic. We need to calculate number atoms, which can be determined as follows:
We know that $1$ mol contains $6.02214076\times {{10}^{23}}$ number of atoms. i.e. is Avogadro’s constant.
$1$ mol $=6.02214076\times {{10}^{23}}$ atoms
Let $3.5$ mol $=x$ atoms
$x$ atoms $=3.5\times 6.02214076\times {{10}^{23}}$
$x=2.11\times {{10}^{24}}$ number of atoms
Therefore the answer to the above question is that the number of atoms in $3.5$ mol of Arsenic is $2.11\times {{10}^{4}}$ number of atoms. Atoms are made up of nuclei which consist of protons and neutrons and the nucleus is surrounded by electrons. Protons are positively charged and balanced by negatively charged electrons. Neutrons are neutral and play a major role in determining different isotopes. The primary use of Arsenic is in alloys of lead. Arsenic occurs in nature as a monoisotopic element of one stable isotope $^{78}\text{As}\text{.}$ Arsenic is highly toxic and are used is the production of pesticides, treated wood products, herbicides and insecticides. These applications are declining with the recognition of the toxicity of arsenic and its compounds.

Additional Information:
The mole may also be used to measure the amount of atoms, ions, electrons, or other entities. The concentration of a solution is commonly expressed by its morality, defined as the amount of dissolved substance is mole per unit volume of solution, for which the unit typically used in moles per litre.
The turn gram-molecule (g mol) was formerly used for mole of molecules and gram atom for mole of atoms. The history of the mole is intertwined with that of molecules mass, atomic mass unit and the Avogadro number. The Avogadro constant ${{N}_{A}}$ Is related to other physical constants and properties.
1. It related molar gas constant & the boltzman constant ${{K}_{B}}$ .
$R={{K}_{B}}{{N}_{A}}$
2. It relates the faraday constant $F$ and the elementary charge $e$.
$F=e{{N}_{A}}$
3. It relates the molar mass constant, $Mu$ & atomic moss unit ${{M}_{u}}$.
${{M}_{u}}=Mu{{N}_{A}}$
The Avogadro constant also relates the molar volume of a substance to the average volume nominally occupied by one of its particles, when both are expressed in the same units of volume.

Note: In a solid the constituent particles are fixed and bond is a lattice arrangement, yet they may be repairable without losing their chemical identity. Thus the solid is composed of a certain number of moles of such particles. In other cases, such as diamond, the entire crystal is essentially a single molecule, the mole is still used to express the number of atoms bound together, rather than a count of multiple molecules. The official mole is based on an outdated continuum concept of matter. The mole is not a true metric unit, rather it is a parametric unit, and amount of substance is a parametric base quantity. The Avogadro constant also relates the molar volume of a substance to the average volume nominally occupied by one of its particles, when both are expressed in the same unit of volume. The mass of one mole of any substance in $N$ times the average mass of one of its constant particles.