​Calculate number of neutrons present in 12 × 1025 atoms of oxygen (8O17). (Given NA = 6 × 1023 atoms)

(A) 1800 (B) 1600 (C) 1800 NA (D) 3200 NA

1 atom of oxygen has = 17 - 8 = 9 neutronsSo 12 × 1025 atoms has = 9 × 12 × 1025 neutrons                      =108 × 1025                        = 10800 × 1023                = 1793 × 6 × 1023       = 1793 NASo option C is close to your answer. 

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