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Chemistry Formulae
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:
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