Find the total number and the total mass of neutrons in 7 milligram of carbon 14
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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 of C-14
= 2.4092 � 1021
(b) Mass of one neutron = 1.67493 � 10�27 kg
Mass of total neutrons in 7 g of 14C
= (2.4092 � 1021) (1.67493 � 10�27 kg)
= 4.0352 � 10�6 kg
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