Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C.(Assume that mass of a neutron = 1.675 × 10–27 kg). - Chemistry

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Numerical

Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C.
(Assume that mass of a neutron = 1.675 × 10–27 kg).

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Solution

Number of atoms of 14C in 1 mole = 6.023 × 1023

Since 1 atom of 14C contains (14 - 6) i.e., 8 neutrons, the number of neutrons in 14 g of 14C is (6.023 × 1023) ×8. Or, 14 g of 14C contains (6.022 × 1023 × 8) neutrons.

Number of neutrons in 7 mg

`= (6.022 xx 10^(23)xx8xx7 " mg")/(1400 " mg")`

= 2.4092 × 1021

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Chapter 2: Structure of Atom - EXERCISES [Page 69]

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NCERT Chemistry Part 1 and 2 Class 11
Chapter 2 Structure of Atom
EXERCISES | Q 2.2 - (ii) | Page 69

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