College

Physical chemistry–A

Mole concept :-
Mole – chemical unit for number mass and volume
* Mole in terms of number : –
Collection f number 6.022 x 1023
Particles of any substance is called one mole
One mole = 6.022 x 1023 particles
= Avogadro number
One mole = 602 200 000 000 000 000
Number of moles = no of particles given / 6.022 x 1023
( 1 ) calculate the no of mole in 6.022 x 1025 particles
Ans. – no of mole = 6. 022 x 1025 / 6.022 x 1023 =100
6.022 x 1023particles = 1 mole
6.022 x1023 = 100 mole
* Mole in terms of mass : –
Weight of 6.022 x 1023particles of any substance in gm is called one mole
One mole Na = 23gm
One mole Ca = 40gm
Formula wt of any substance in gm is called one mole
One mole NaoH = 23 +16+1 = 40
One mole CaCO3 = 40+12+16×3 =100
One mole NaCO3 = 23X2+12+16X3 = 106
One mole KMnO4 = 39+25+16×4 = 157gm
One mole K2Cr2 = 39X2+52X2+16X7 =294gm
One mole C12 H22O11 = 12×12+1×22+16×11 =342gm
One mole FeC2O4 = 56+12X2+16X4 =144gm
One mole NH2CONH4 = 14+2+12+16+14+2 =60gm
One mole H2SO4 = 2+32+16X4 =98gm
One mole H3PO4 = 3+31+16X4 = 98gm
Substance particles formulatant mole element atom at gm atom·
( H , Na ,K )
Compound molecular gm mole or gm molecular
( H2, HCL Nacl )
Radical 10w ionic gm ion ( H+,CH-,Cl- )
Use of mole concept of element
One mole Ca = 6.022×01023 atom = 40gm
= one gm atom of ca
One mole Na = 6.022x1023atom = 23gm
One mole of x = one gm atom of x
One mole = 10 decimal = 100 centimole
= 1000millimole
No of electron in one atom of an electron =at no
No of e2 in one atom of ca =20e2 = 20p

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