Question

2. The mass of a molecule of water is (1) 3 x 10-26 kg (2) 3x10 25 kg (3) 1.5 x 10-26 kg (4) 2,5 x 10-26 kg
pls give correct answer with full explanation its urgent ​

Answer 1

Answer:

(1) 3 x 10⁻²⁶ kg

Explanation:

Molecular mass of Water (H₂0) ⇒ 1 + 1 + 16 ⇒ 18

By, Avogadro's Theorem

1 mole of H₂0 = 18g of H₂0 = 6.022 × 10⁻²³ molecules of H₂0

Thus, 1 molecule =  18 / 6.022 × 10⁻²³ ⇒ 3 × 10²³ g ⇒ 3 × 10²⁶ kg