Question

Number of moles of neutrons in 18 gram of h2o is

Answer 1

Answer:

8

Explanation:

Number of moles of H2O = given mass/molar mass

→ moles of H2O = 18/18 (molar mass of H2O = (1 × 2) + (16) = 18)

→ moles of H2O = 1 mole

Now, 1 mole of H2O will contain 6.022 × 10²³ molecules of H2O.

(1 mole = 6.022 × 10²³)

And, one molecule of H2O has 8 neutrons. (Hydrogen here has 0 neutrons and Oxygen has 8)

So, 6.022 × 10²³ molecules of H2O will have 8 × 6.022 × 10²³ neutrons.

Now, moles = Number of molecules/Avogadro Number

(Avogadro Number = 6.022 × 10²³)

→ number of moles of neutrons = (8 × 6.022 × 10²³)/(6.022 × 10²³)

→ number of moles of neutrons = 8.