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KCET2013ChemistrySome Basic Concepts of Chemistry

The number of water molecules present in a drop of water weighing 0.018 ~g is

Options

  1. A6.022 10²⁶
  2. B6.022 10²³
  3. C6.022 10¹⁹
  4. D6.022 10²⁰

Correct answer

D. 6.022 10²⁰

Step-by-step solution

18 ~g _ of H ₂ O =1 ~mol of H ₂ O =6.022 10²³ molecules 0.018 ~g of H ₂ O = 0.018 18 ~mol of H ₂ O = 0.018 18 6.022 10²³ molecules =6.022 10²⁰ molecules

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