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Answer 1

Answer:

Helo mate

18ml=18gm=1mole=Na molecules

54molecules=3 moles

1mol=2atom H+1atom O

H=O electrons

O=8 electrons

Total neutrons in 1 molecule water

is equal to 8 electrons

24Na molecules

Answer 2

Total number of neutrons in :

Hydrogen = 1

2 oxygen = 8+8 = 16

therefore total number of neutrons in 1 molecule of water = 16+1=17

Number of moles = Given mass / Molecular mass

density = mass / volume

mass = density × volume = 0.99×54≈1×54= 54g

n= w/m = 54/18

n=3

Therefore the number of moles is equal to 3

Number of molecules in 3 moles= Avogadro number ×n

Number of molecules of water = 3×N° (N° = Avogadro number)

Therefore the total number of neutrons = Number of moles× Number of neutrons in 1 molecule

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