Question

1. Which of the following correctly represents 360g of water?

(i) 2 moles of water
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water​

Answer 1

Answer:

● The correct options are:

(ii) 20 moles of water

(iv) 1.2044 × 10*25 molecules of water

Answer 2

Answer :-

Option (ii) 20 moles of water and Option (iv) 1.2044×10²⁵ molecules of water, correctly represents 360g of water.

Explanation:-

• Molar mass of Hydrogen (H) = 1g/mol

• Molar mass of Oxygen (O) = 16g/mol

• Avogadro Number = 6.022×10²³

Hence, molar mass of water [H₂O] :-

= 1×2+16

= 18g/mol

Number of moles in 360g of water :-

= Given Mass/Molar mass

= 360/18

= 20 moles ✓

Number of molecules in 360g of water :-

= No of moles × Avogadro Number

= 20×6.022×10²³

= 120.44×10²³

= 1.2044×10²⁵ molecules ✓

Hence , option (ii) and (iv) are correct !