Question

3.011×10^22 atoms of an element is 1.4g.the atomic weight of element is:-



Please give answer

Answer 1

Answer:

atomic weight of element is 28

Explanation:

Convert no of atoms to moles

moles = No of atoms/Avagadro's number

moles = (3.011*10^22)/(6.022*10^23)

moles = 0.05

moles = given mass/atomic mass

0.05 = 1.4/atomic mass

atomic mass = 1.4/0.05 = 28

Element weight = 28 u

Element is Nickel

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Answer 2

Answer:

2.8

Explanation:

no.of moles= no.of atoms/Avogadro's no.

                    =3.011 x 10^22/6.022/10^22

                    =0.5

no.of moles=given mass/atomic mass

       0.5       =  1.4/atomic mass

 atomic mass=     1.4/0.5

                      =1.4 x 10/0.5 x 10

                       =14/5

                       =2.8