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NEETChemistrySome Basic Concepts of Chemistry

Two identical flasks contain an equal number of molecules of SO ₂ and CH ₄ gases respectively, under the same conditions. What is the ratio of the mass of SO ₂ to the mass of CH ₄ in the flasks?

Options

  1. A1:4
  2. B1:1
  3. C4:1
  4. D2:1

Correct answer

C. 4:1

Step-by-step solution

Since both flasks contain an equal number of molecules, they must contain an equal number of moles of the respective gases. Let the mass of SO ₂ be m₁ and the mass of CH ₄ be m₂ . Molar mass of SO ₂ = 32 + 2 16 = 64 g mol ⁻¹ Molar mass of CH ₄ = 12 + 4 1 = 16 g mol ⁻¹ Number of moles of SO ₂ = m₁ 64 Number of moles of CH ₄ = m₂ 16 Equating the number of moles: m₁ 64 = m₂ 16 m₁ m₂ = 64 16 = 4 1 The ratio of the mass of SO ₂ to the mass of CH ₄ is 4:1 . Answer: 4:1

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