1.

Calculate the number of moles for the following: (i) 52 g of He (finding mole from mass) (ii) 12.044 xx 10^(23) number of He atoms (finding mole from number of particles).

Answer»

Solution :No. of MOLES = n
Given mass = m
MOLAR mass =M
Given NUMBER of particles = N
Avogadro number of particles = `N_(0)`
(i) Atomic mass of He = 4 u
Molar mass of He = 4g
Thus, the number of moles `= ("given mass")/("molar mass") implies n=(m)/(M)=(52)/(4) = 13` mole
(II) 1 mole = `6.022 xx 10^(23)`
The number of moles = `("given number of particles")/("Avogadro number")`
`implies n=(N)/(N_(0))=(12.044 xx 10^(23))/(6.022 xx 10^(23))`
= 2 mole


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