Basic Concepts of Chemistry
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1
1 amu =?
1.66*10^-27 kg
2
average atomic mass
(M1X+M2Y)/X+Y) where X and Y can be in percentage or fraction of it is in percentage then X+Y=100% if in fraction X+Y=1
3
number of atom in molecules
number of molecules × atomicity
4
specific gravity=?
density of substance/density of H2O at 4°C
5
for gases absolute density and vapour density=?
absolute density=PM/RT vapour density= Molecular mass/2 defined as density of gas with respect to H2 gas t same temperature and pressure
6
Equivalent mass =?
molar mass/n-factor
7
n-factor=?
n-factor= valency of atom ,total charge on an ion , total charge on cation or anion,no of oH ions released, no of H+ released
8
percentage composition of a composition
mass%of an element=(mass of element /mass of compound)*100%
9
minimum molecular mass
(atomic mass of element/percentage of element in compound)*100
10
empirical formula and molecular formula equation
MF=(EF)n
11
stoichiometry (mole comparison for find limiting reagent)
given molealanced equation mole ( the minimum of this is the limitingreagent )
12
percentage purity
(amount of reactants calculated from the chemical equation/amount of reactants taken)×100%
13
percentage yield
(actual yeld/theoretical yield )*100%
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