Question

(i) Calculate the number of molecule in 28gm of H20.0​

Answer 1

Explanation:

18 gm of H2O contains 6.022×10^23 molecules

28 gm of H2O contains (6.022×10^23)÷18 ×28

= 9.3×10^23 molecules

Answer 2

Answer:

No. of molecules = ?

given mass = 28g

molar mass of H2O = 18 g / mol

no. of moles = given mass / molar mass

no. of moles = no. of molecules / avogadro's no.

≈ given mass / molar mass = no.of molecules / avogadro's no.

28 / 18 = no. of molecules / 6.022 × 10²³

28 / 18 × 6.022 × 10²³ = no. of molecules

1.56 × 6.022 × 10²³ = no. of molecules

9.39432 × 10²³ = no. of molecules