# All formulas from lesson- Some basic concepts of chemistry.

By Shivank Goel|Updated : August 11th, 2022

1) Number of molecules in W(g) of substance = wxNA/gram molecular mass

Where NA is the Avogadro number which is equal to 6.022 x 1023

2) Number of gram atoms = w/gram atomic mass

3) Number of gram molecules = w/gram molecular mass

4) Number of molecules in V liter of gas at STP = VxNA/22.4

5) Mass of 1 atom of element = gram atomic mass/NA

6) Mass of 1 molecule of substance = molar mass/NA

7) Molality, m = Mx1000/ (1000ρ - Mxw)

Where M = Molarity

m = molality

ρ = density of the solution in g/ml

w = molecular weight (molar mass) of solute in g/mole

8) Molarity, M = n/V

Where n is the number of moles of the solute

V is the volume of the solution in liters.

9) Molecular mass = 2 x vapour density

10) Number of molecules in n moles of substance = nxNA

11) Temperature in kelvin can be converted to degrees celsius as

T(K) = T(°C) + 273.15

12) Temperature in Fahrenheit can be converted to degrees celsius as

T(F) = (9/5)T(°C) + 32

13) Mass percent = Mass of solute/Mass of solution x 100

14) Mole fraction of A = number of moles of A/number of moles of solution

Therefore, all formulas from the lesson- Some basic concepts of chemistry are mentioned above.

Summary:

## All formulas from the lesson- Some basic concepts of chemistry.

All formulas from the lesson- Some basic concepts of chemistry are mentioned above.

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