Question

. The correct arrangement of the following in order of
increasing mass is
(1) nitrogen molecule ; (II) oxygen atom
(III) 1 Avogram ;(IV) 1x10^-¹⁰g-atom of copper​

Answer 1

Answer:

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Answer 2

Answer:

(1) 1 molecule of oxygen=O

2

∴ Mass of O

2

=

N

A

16×2

=

N

A

32g

=

6.022×10

23

32

=5.3×10

−23

g

(2) 1 atom of Nitrogen=

N

A

1

moles

=

6.022×10

23

1

moles

=1.66×10

−24

moles

∴ Mass of 1 atom of Nitrogen=1.66×10

−24

×14

=23.2×10

−24

g

(3) 1×10

−10

gm molecule of oxygen=1×10

−10

moles of O

2

∴ Mass of 1×10

−10

gm molecule of oxygen=1×10

−10

×32

=3.2×10

−9

g

(4) Mass of copper=1×10

−10

gm

Comparing the masses in (1), (2), (3) and (4)

we get, (2)<(1)<(4)<(3)

Therefore, answer is (II)<(I)<(IV)<(III