Question

Find the number of molecules and atoms electrons protons and neutrons of 1.7 gram of ammonia


I need answer with explanation.

Answer 1

given, weight of Ammonia , NH3 = 1.7gm

molecular weight of Ammonia = 17g/mol

so, mole of Ammonia = 1.7/17 = 0.1 mole

number of molecules of ammonia = 0.1 × 6.023 × 10²³

= 6.023 × 10²²

number of atoms in an ammonia molecule = 3

so, total number of atoms in 1.7gm ammonia = 6.023 × 10²² × 3

= 18.069 × 10²² = 1.8069 × 10²³

number of electrons in a NH3 molecule = 7 + 3 = 10

so, total number of electrons in 1.7gm of ammonia = 10 × number of molecules

= 10 × 6.023 × 10²²

= 6.023 × 10²³

in neutral molecule, number of electrons = number of protons

so, total number of protons = 6.023 × 10²³

number of neutrons = 7 + 0 + 0 = 7

so, number of neutrons in 1.7gm of ammonia = 7 × 6.023 × 10²²

= 42.161 × 10²²

= 4.2161 × 10²³

Answer 2

Answer:

Explanation:

To answer this question, we must have knowledge of:

a) Molecular formula - which represents the number of atoms present in one molecule of the compound

b) Moles -  which is equivalent to 6.022 x 10²³ entities and relates mass of compound and number of entities present in that given mass.

c) Atomic number - represents number of protons in an atom. in an electrically neutral atom, it is also equal to number of electrons present.

d) Mass number - represents number of protons and number of neutrons in an atom.

Given, mass of ammonia = 1.7 gram

Number of moles of ammonia = given mass/molar mass

                                                  = 1.7 g/ 17 g/mol

                                                   = 0.1 moles

CALCULATION OF NUMBER OF MOLECULES

Number of NH₃ molecules in 0.1 mole of ammonia

= 0.1 x 6.022 x 10²³

= 6.022 x 10²² molecules

CALCULATION OF NUMBER OF ATOMS

From the molecular formula, NH₃, we can see that there are 1 nitrogen atom and 3 hydrogen atom.

Thus in one molecule, number of total atoms = 4

In 6.022 x 10²² molecules, number of total atoms = 4 x 6.022 x 10²²

                                                                                   = 24.088 x 10²² atoms

CALCULATION OF NUMBER OF ELECTRONS AND PROTONS

Atomic number of nitrogen = 7

Atomic number of hydrogen = 1

Thus,

Number of protons/electrons in nitrogen = 7

Number of protons/electrons in hydrogen = 1

Total number of protons/electrons in Ammonia = 7 + 3 x 1 = 10

Thus, number of protons/electrons in 6.022 x 10²² molecules of ammonia = 10 x 6.022 x 10²² = 6.022 x 10²³

CALCULATION OF NUMBER OF NEUTRONS

Mass number of nitrogen = 14

Thus number of neutrons in nitrogen = mass number - atomic number

                                                              = 14 - 7 = 7

Mass number of hydrogen = 2

Number of neutrons in nitrogen = 2 - 1 = 1

Total number of neutrons in one molecule of ammonia = 7 + 3 x 1 = 10

Number of neutrons in 6.022 x 10²² molecules of ammonia

= 6.022 x 10²² x 10

= 6.022 x 10²³