Give me answer of this mcqs.

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Please ask single question in single thread.

1) The molar mass of water is 18.
Thus, 18 g of water contains, Avogadro's number (NA)of water molecule.
Therefore, 540 g of water will have 54018×NA=30NA
​​​​Hydrogen has no neutrons and oxygen has 8 neutrons.
Water compose of two hydrogen atoms and one oxygen atom.
Thus total number of neutrons in each water molecule is 8.
Therefore, total number of neutrons in 540 g of water is,
30NA×8=240 NA
​​​Answer is a.


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