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How many moles are in 36 grams of water (H2O)?

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Question: How many moles are in 36 grams of water (H2O)?

Options:

  1. 1
  2. 2
  3. 0.5
  4. 3

Correct Answer: 1

Solution: 

Molar mass of H2O = 2*1 + 16 = 18 g/mol. Number of moles = mass/molar mass = 36 g / 18 g/mol = 2 moles.

How many moles are in 36 grams of water (H2O)?

Practice Questions

Q1
How many moles are in 36 grams of water (H2O)?
  1. 1
  2. 2
  3. 0.5
  4. 3

Questions & Step-by-Step Solutions

How many moles are in 36 grams of water (H2O)?
  • Step 1: Find the molar mass of water (H2O). Water has 2 hydrogen atoms and 1 oxygen atom.
  • Step 2: Calculate the mass of hydrogen: 2 hydrogen atoms * 1 gram/mole = 2 grams/mole.
  • Step 3: Calculate the mass of oxygen: 1 oxygen atom * 16 grams/mole = 16 grams/mole.
  • Step 4: Add the mass of hydrogen and oxygen to get the molar mass of water: 2 grams/mole + 16 grams/mole = 18 grams/mole.
  • Step 5: Use the formula for number of moles: Number of moles = mass / molar mass.
  • Step 6: Plug in the values: Number of moles = 36 grams / 18 grams/mole.
  • Step 7: Calculate the number of moles: 36 grams / 18 grams/mole = 2 moles.
  • Molar Mass Calculation – Understanding how to calculate the molar mass of a compound by summing the atomic masses of its constituent elements.
  • Mole Concept – Applying the definition of a mole to convert mass into moles using the formula: moles = mass / molar mass.
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