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How many moles are in 180 grams of water?

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Question: How many moles are in 180 grams of water?

Options:

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Correct Answer: 1

Solution: 

Molar mass of H2O = 2*1 + 16 = 18 g/mol. Number of moles = 180 g / 18 g/mol = 10 moles.

How many moles are in 180 grams of water?

Practice Questions

Q1
How many moles are in 180 grams of water?
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Questions & Step-by-Step Solutions

How many moles are in 180 grams of water?
  • Step 1: Identify the chemical formula of water, which is H2O.
  • Step 2: Calculate the molar mass of water. This is done by adding the mass of hydrogen and oxygen.
  • Step 3: There are 2 hydrogen atoms in water. The atomic mass of hydrogen is approximately 1 g/mol. So, 2 * 1 = 2 g/mol for hydrogen.
  • Step 4: There is 1 oxygen atom in water. The atomic mass of oxygen is approximately 16 g/mol.
  • Step 5: Add the mass of hydrogen and oxygen together: 2 g/mol (from hydrogen) + 16 g/mol (from oxygen) = 18 g/mol. This is the molar mass of water.
  • Step 6: Use the formula to find the number of moles: Number of moles = mass (in grams) / molar mass (in g/mol).
  • Step 7: Substitute the values into the formula: Number of moles = 180 g / 18 g/mol.
  • Step 8: Calculate the number of moles: 180 g / 18 g/mol = 10 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 mole concept to convert grams of a substance to moles using its molar mass.
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