Clacjlate the number of particles in each of the following:
(i) 46g of Na atoms(number from Mass)
(ii)8g 02 Molecules(number of Molecules from mass)
(iii)0.1mole carbon(number from given moles)
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(i)The number of atoms
given Mass
----------------- Avogadro number
molar mass
N m
----- N 0
M
N 46
------- 6.022 10²³
23
N 12.044 10²³
(ii)The number of Molecules
given mass
-------------------- Avogadro number
molar mass
N m
----- N0
M
atomic mass of oxygen 16 u
Therefore,
molar mass of O2 Molecules
=16*2=32g
N 8
---- 6.022 10²³
32
=1.51 10²³
(iii)The number of particles (atom)=number of moles of particle*Avogadro number
N=n*N0=0.1*6.022*10²³
=6.022*10²³
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it was helpful:-)
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