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How many molecules are present in 2 moles of water (H2O)?

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Question: How many molecules are present in 2 moles of water (H2O)?

Options:

  1. 6.022 x 10^23
  2. 1.2044 x 10^24
  3. 3.011 x 10^23
  4. 12.044 x 10^24

Correct Answer: 1.2044 x 10^24

Solution: 

Number of molecules = moles x Avogadro\'s number = 2 moles x 6.022 x 10^23 molecules/mole = 1.2044 x 10^24 molecules.

How many molecules are present in 2 moles of water (H2O)?

Practice Questions

Q1
How many molecules are present in 2 moles of water (H2O)?
  1. 6.022 x 10^23
  2. 1.2044 x 10^24
  3. 3.011 x 10^23
  4. 12.044 x 10^24

Questions & Step-by-Step Solutions

How many molecules are present in 2 moles of water (H2O)?
Correct Answer: 1.2044 x 10^24 molecules
  • Step 1: Understand that 1 mole of any substance contains a specific number of molecules, known as Avogadro's number.
  • Step 2: Know that Avogadro's number is approximately 6.022 x 10^23 molecules per mole.
  • Step 3: Identify that you have 2 moles of water (H2O).
  • Step 4: Use the formula: Number of molecules = moles x Avogadro's number.
  • Step 5: Substitute the values into the formula: Number of molecules = 2 moles x 6.022 x 10^23 molecules/mole.
  • Step 6: Calculate the result: 2 x 6.022 = 12.044, so you have 12.044 x 10^23 molecules.
  • Step 7: Write the final answer in scientific notation: 1.2044 x 10^24 molecules.
  • Moles and Avogadro's Number – Understanding the relationship between moles and the number of molecules using Avogadro's number (6.022 x 10^23).
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