Question

The total no. Neutrons present in 54 ml H20 are

Answer 1

HEYA!?

Number of neutrons in 18 ml or 1 mole = (  8 ) × NA = 10 NA  reason - hydrogen has no neutrons

Therfore number of neutrons In 3 moles = 3 × 8 = 24 NA( avogadros number = 6.06.023 × 10^23 )

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Answer 2

Given :

Volume of water (H2O) = 54 ml

To Find :

Total number of neutrons

Formula used :

$n = \dfrac{given \: mass}{molar \: mass}$

n is the number of moles.

Solution :

We know,

Density = 1 g/ml [ For water]

And, as

$Density = \dfrac{mass}{volume} \\ \\ 1 = \dfrac{mass}{54} \\ \\ 54 = mass$

Now,

Molar mass = (2× mass of H+ mass of oxygen )

Molar mass = (2×1 + 16) = 18 g

$n = \dfrac{given \: mass}{molar \: mass} \\ \\ n = \dfrac{54}{18} = 3$

Hence,

Number of neutrons in 1 mole = 8 NA

Number of neutrons in 3 moles = 24 NA.

Note: NA represents Avogadro's number (6.023×10²³).