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A spherical ball of radius 7cm contains ...

A spherical ball of radius 7cm contains 56% iron. If density is `1.4g"/"cm^(3)`, number of moles of Fe present approximately is

A

`10`

B

`15`

C

`20`

D

`25`

Text Solution

Verified by Experts

The correct Answer is:
C
Volume of spherical ball `=(4)/(3)pi r^(3)=(4)/(3)xx(22)/(7)xx(7)^(3)`
Mass `=Vxxd=(4)/(3)xx(22)/(7)xx(7)^(3)xx1.4 g`
`Fe (56%)=(4)/(3)xx(22)/(7)xx(7)^(3)xx1.4xx(56)/(100) g =1126.4` , number of moles of `Fe=20`
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