Answer to Question #142593 in Electric Circuits for Giren

Question #142593
Calculate number of neutrons present in 12x10^25 atoms Of oxygen (80^17) :
(Given: NA = 6x 10^23)
(a) 1800
(b) 1600
(C) 1800 NA
(d) 3200 NA
1
Expert's answer
2020-11-11T08:57:54-0500

Solution: The answer is 1800NA1800N_A . i.e option C.


Atomic number =P=8=P=8 .


Atomic Mass =N+P=17.= N+P = 17.


Therefore N=9,N = 9, Which is number of neutrons.


Total number of neutrons in 12×1025atoms=9×12×1025=9×12×1025×NA6×102312\times10^{25} atoms = 9\times 12\times 10^{25}=\frac{9\times12\times10^{25}\times N_A}{6\times10^{23}}


=1800NA=1800N_A .


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