Question

Choose the correct option.

Which of the following has maximum number of molecules?

Options

• 7gN₂

• 2gH₂

• 8gO₂

• 20gNO₂

Answer 1

2gH₂

Explanation:

1 mole of any element contains 6.023 × 10²³ molecules.

1 g mole of O₂ = 32 g O₂

⇒ 16 g of O₂ = 0.5 g mole O₂

1 g mole of N₂ = 28 g N₂

⇒ 7 g N₂ = 0.25 g mole N₂

1 g mole of H₂ = 2 g H₂

⇒ 2 g H₂ = 1.0 g mole H₂

1 g mole NO₂ = 14 + 16 × 2 = 46

⇒ 16 g of NO₂ = 0.35 mole NO₂

2 g H₂ (1 g mole H₂) contain maximum molecules.