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NEETChemistrySome Basic Concepts of Chemistry

Which of the following contains the maximum number of electrons?

Options

  1. A3.6 g of H ₂ O
  2. B4.0 g of He
  3. C4.4 g of CO ₂
  4. D3.2 g of CH ₄

Correct answer

C. 4.4 g of CO ₂

Step-by-step solution

Number of moles = Given mass Molar mass Total number of electrons = Number of moles N _ A ( Number of electrons per molecule ) 1) 3.6 g of H ₂ O : Moles = 3.6 18 = 0.2 mol Electrons per H ₂ O molecule = 2(1) + 8 = 10 Total electrons = 0.2 10 N _ A = 2.0 N _ A 2) 4.0 g of He : Moles = 4.0 4 = 1.0 mol Electrons per He atom = 2 Total electrons = 1.0 2 N _ A = 2.0 N _ A 3) 4.4 g of CO ₂ : Moles = 4.4 44 = 0.1 mol Electrons per CO ₂ molecule = 6 + 2(8) = 22 Total electrons = 0.1 22 N _ A = 2.2 N _ A 4) 3.2 g of CH ₄ : M

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