The mass of one molecule of a substance is 2.989×10-22power g .What is it's molecular mass
Answers
Given that,
▪ Mass of one molecule of a substance is
2.989 × 10⁻²² g
We know that, Molecular mass the mass of one mole of molecules/atoms of any substance which is indirectly equal to the mass of 6.022 × 10²³ molecules/atoms of that particular substance.
So,
⇒ 1 molecule ➞ 2.989 × 10⁻²² g
Molecular mass can be calculated as,
⇒ Moleculer mass = 2.989 × 10⁻²² × 6.022 × 10²³
⇒ Moleculer mass = 17.999 × 10
⇒ Moleculer mass = 179.99 g
Or approximately,
⇒ Moleculer mass ≈ 180 g
Some Information :-
- Molecular mass or molar mass is the mass of one mole (6.022 × 10²³) of moelcules or atoms.
- Number of moles = Mass / Molar mass
- Molecules of non Ideal gases are generally found in combination of the same atoms of that substance. For e.x., H₂ , O₂
Explanation:
Given :
- mass of one molecule of a substance is 2.989×10⁻²²g
To Find :
- What is it's molecular mass
Solution :
Now we know that : -
→ Molecular mass = Mass of 1 mole ...(1)
→ 1 mole = 6.023 × 10²³ molecules ...(2)
Now, from eq. 1 and eq.2, we get:-
Molecular mass = Mass of 6.023 × 10²³
molecules
Mass of 1 molecule = 2.989 × 10⁻²²g
Thus, mass of 6.023×10²³ molecules :-
= 2.989 × 10⁻²² × 6.023 × 10²³
= 18 × 10²³ ⁻ ²²
= 18 × 10
= 180g
Thus, molecular mass of the substance 180u.