Question

What is the fraction of the mass of water due to neutrons?

  • Atoms and molecules CBSE Class 9
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Answer

Mass of one mole (Avogadro Number) of neutrons ~ 1 g

Mass of the one neutrons =(1 / 𝐴𝑣𝑜𝑔𝑎𝑑𝑟𝑜 𝑁𝑢𝑚𝑏𝑒𝑟 (𝑁𝐴)) g

Mass of 8 molecule of water = 𝑀𝑜𝑙𝑎𝑟 𝑚𝑎𝑠𝑠 / 𝑁𝐴

= 18 / 𝑁𝐴    g

There are 8 neutrons of water = 18 / 𝑁𝐴

Mass of one molecule of water = 𝑀𝑜𝑙𝑎𝑟 𝑚𝑎𝑠𝑠 / 𝑁𝐴

= 18 / 𝑁𝐴   g

Fraction off mass of the water due to neutrons ~ 8 / 18

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