Question

sample of some molecule are given below
5NO2, NH3, 5HNO3, 7Kl
a. find the total number atoms in each sample
b. which sample has more number or atoms
c. arrange the sample in the increasing order of number atom
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Answer 1

Explanation:

5No2. -15

NH3-. 4

5HNO3. -25

7kl--. 14

2)-HNO3

3)-NH3

7KL

5NO2

5HNO3

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Answer 2

When two atoms come together through different bonds then they make up a molecule and atoms are the smallest units of a molecule or simply molecules are made up of atoms.

Atom

• Any solid, liquid, or gas is made up of atoms. It consists of three basic particles electrons, protons, and neutrons.
• The nucleus is the central region of the atom. It has protons and neutrons out of which protons are positively charged.
• The neutrons are of zero charges and the outermost region of an atom is called the electron shell. the electron shell contains the electrons each is negatively charged.

a. Calculation of the total number of atoms :

• First the elements present in the compounds are to be listed. then, the subscripts and coefficients are taken into account and the number of atoms of each element is calculated individually.
• In the end all the numerical values of different elements in the compound are taken and added up to get the end value which represents the total number of atoms in the given sample.

$5NO_{2}$

Here there are 2 oxygen molecules and 1 nitrogen atom so,

    $2 O + 1 N = 3 atoms.$

but there are 5 such $NO_{2}$ hence it is

$3 * 5 = 15 atoms$

Hence the number of atoms in $5NO_{2}$ is 15

$NH_{3}$

Here there are 3 hydrogen atoms and 1 nitrogen atom so,

$1 N + 3 H = 4 atoms$

Hence the number of atoms in $NH_{3}$ is 4

$5HNO_{3}$

Here there are 3 oxygen atoms, 1 hydrogen, and 1 nitrogen atom so,

$1 H + 1 N + 3 O = 5 atoms$

but there are 5 such $5HNO_{3}$

therefore,$5 * 5HNO_{3} = 25 atoms$

Hence the number of atoms in $5HNO_{3}$ is 25

$7KI$

Here there are 1 potassium, and 1 iodine atom so,

$1K + 1I = 2 atoms$

but there are 7 such $7KI$

therefore, $2 * 7KI = 14 atoms$

Hence the number of atoms in $7KI$ is 14

b.  By calculation:

• The number of atoms in $5HNO_{3}$ is 25
• the number of atoms in $7KI$ is 14
• the number of atoms in $NH_{3}$ is 4
• the number of atoms in $5NO_{2}$ is 15

therefore, the sample which has more number of atoms is $5HNO_{3}$ with 25 atoms

c. Increasing order of the molecules with respect to their number of atoms is,

$NH_{3}$ , $7KI$ , $5NO_{2}$ ,$5HNO_{3}$. i.e (4, 14, 15, 25 respectively)