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if the mass of 0.25 moles of an element x is 2.25 g,the mass of one atom of x is about:

if the mass of 0.25 moles of an element x is 2.25 g,the mass of one atom of x is about:

Grade:12

2 Answers

bhanu p
15 Points
12 years ago

It is given that, 0.25mol weighs 2.25g => 1mol weighs 9g .

Then also 9g contains  (6.022)1023 atoms  => 1 atom weighs 9/(6.022)1023  ~ (1.5)10-23 g.

Nihal Anand
13 Points
2 years ago
We have,
 
Mass of 0.25 moles = 2.25g
Therefore, weight of 1mole = 2.25g/0.25 = 9g
Now,
Mass of atoms = 9g/ NA (avogrado's no.)
                           = 9g/6.022*10^23
                           =1.494520093*10^-23 ~1.5*10^(-23)

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