Question

How many dozens of copper atoms are in a penny.?

Answer 1

There is 2.5 .10²¹ dozen  of copper atoms are in a penny

Further explanation

Stochiometry in Chemistry learns about chemical reactions mainly emphasizing quantitative, such as calculation of volume, mass, number, which is related to the number of ions, molecules, elements etc.

In chemical calculations, the reaction can be determined, the number of substances that can be expressed in units of mass, volume, mole, or determine a chemical formula, for example the substance level or molecular formula of hydrate.

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

While the number of moles can also be obtained by dividing the mass (in grams) with

While the number of moles can also be obtained by dividing the mass (in grams) with

$\large{\boxed{\bold{mole\:=\:\frac{grams}{ the\:relative\:mass\:of\:elements\:or\:the relative\:mass\:of\:molecules} }}}$

The complete question must be :

A pure copper penny contains approximately 3.0. 10²² copper atoms.

1 doz = 12

1 gross = 144

1 ream = 500

1 mol = 6.022 . 10²³

Use these definitions to determine the following:

How many dozens of copper atoms are in a penny.

Because there is 12 atoms for 1 dozen then , in a penny

3.0. 10²² : 12 atoms = 2.5 .10²¹ dozen

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Keywords: mole, Avogadro’s number, a penny, copper, atoms

Answer 2

$\boxed{2.5 \times {{10}^{21}}{\text{ dozen}}}$ ofcopper atoms are present in a penny.

Further Explanation:

Atom is the smallest particle and is building block of matter. It comprises of a central part called atomic nucleus that is surrounded by electrons revolving in circular orbits. Atomic nucleus consists of protons and electrons while electronsare present around it. Electrons are negatively charged particles, protons are positively charged particles and neutrons have no charge.

To calculate:

Number of copper atoms in 1 penny

One penny of pure copper consists of $3.0 \times {10^{22}}{\text{ atoms}}$ of copper. A dozen is one of the units of measurement. 12 quantities of anything make up one dozen. So one dozen is equivalent to 12 quantities. Such quantities can be atoms, molecules, ions, formula units and many other things as are required according to the problem to be solved.

Since 12 atoms are present in one dozen, number of dozen in $3.0 \times {10^{22}}{\text{ atoms}}$  of copper can be calculated as follows:

$\begin{aligned}{\text{Number of dozen}} &= \left( {3.0 \times {{10}^{22}}{\text{ atoms}}} \right)\left( {\frac{{1{\text{ dozen}}}}{{12{\text{ atoms}}}}} \right) \\&= 2.5 \times {10^{21}}{\text{ dozen}} \\\end{aligned}$  

Learn more:

1. How many moles of Cl are present in 8 moles of ${\text{CC}}{{\text{l}}_4}$? https://brainly.com/question/3064603
2. Calculate the moles of ions in HCl solution: https://brainly.com/question/5950133

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Mole concept

Keywords: penny, copper atoms, 3.0*10^22 atoms, dozen, 12 quantities, number of copper atoms, pure copper, atoms, ions, molecules, protons, electrons, neutrons, negatively charged, positively charged, no charge.