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प्रश्न
Find:
- the total number and
- the total mass of neutrons in 7 mg of 14C.
(Assume that mass of a neutron = 1.675 × 10−27 kg).
उत्तर
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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