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Chemistry Formulae

VIGYAN
Chemistry Formulae CHEMISTRY - FORMULA By Gyanpoints NEET/MH-CET Formulae sheet 1. SOME BASIC CONCEPTS OF CHEMISTRY Number of molecules: In \(W(g)\) of substance: \[ N = \frac{W(g)}{GMM} \times N_A \] Molality (m): \[ m = \frac{\text{No. of moles of solute}}{\text{Mass of solvent in kg}} \] Number of molecules at S.T.P: In \(V\) litre of gas: \[ N = \frac{V}{22.4} \times N_A \] Number of gram atoms: \[ = \frac{W(g)}{GAM \text{ (gram atomic mass)}} \] Number of gram molecules: \[ = \frac{W(g)}{\text{Gram molecular mass}} \] Dilution formula: \[ M_1 V_1 = M_2 V_2 \] For mixing two solutions of the same substance: \[ M_1 V_1 + M_2 V_2 = M_3 (V_1 + V_2) \] Molarity can be directly calculated from % by mass (w/w) if density is known: \[ \text{Molarity} = \frac{\% \times 10 \times d}{GMM} \] Mass of 1 atom of element A: