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`        Find(i) The total number of neutrons and(ii) The total mass of neutron in 7 mg of 14C.(Assume that mass of neutron = mass of hydrogen atom)`
5 years ago

Jitender Pal
365 Points
```
(i) No. of C atom in 14g of 14C = 6.02 * 1023

∴ No. of C atom in 7 mg (7/1000g) of 14C

= 6.02 *1023 * 7/14 *1000 = 3.01 * 1020

No. of neutrons in 1 carbon atom = 7

∴ Total no. of neutrons in 7 mg of 14C = 3.01 * 1020 *7

= 21.07 *1020

Wt of neutron = wt of 1 hydrogen atom

= 1/6.02 *1023 g

∴ Wt of 3.01 * 1020 * 7 neutrons

= 3.0 *1020 *7/6.02 * 1023 = 3.5 * 10-3g

```
5 years ago
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