how many are contain in 2kg ? Mass of one neutron 1.67 x10^-27kg.



how many are contain in 2kg ? Mass of one neutron 1.67 x10^-27kg.
**Answer:**



**Explanation:**


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**The number of neutrons is equal to the difference in the mass number and atomic number.**


**It is equal to 14−6=8.**



**(a) The number of neutrons present in 7 mg of C-14:**


 **=**


**14**


**7×10**


**−3**



**​**


 **×6.02×10**


**23**


 **×8**



 **=2.408×10**


**21**


 **neutrons**



**(b) Total mass of neutrons in 7 mg of C-14:**


**=2.4088×10**


**21**


 **×1.675×10**


**−27**




**=4.035×10**


**−6**


 **kg.**


