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What is the mass of 0.5 moles of CaCO3?

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Question: What is the mass of 0.5 moles of CaCO3?

Options:

  1. 50 g
  2. 25 g
  3. 100 g
  4. 75 g

Correct Answer: 25 g

Solution: 

Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol. Mass = moles x molar mass = 0.5 moles x 100 g/mol = 50 g.

What is the mass of 0.5 moles of CaCO3?

Practice Questions

Q1
What is the mass of 0.5 moles of CaCO3?
  1. 50 g
  2. 25 g
  3. 100 g
  4. 75 g

Questions & Step-by-Step Solutions

What is the mass of 0.5 moles of CaCO3?
Correct Answer: 50 g
  • Step 1: Identify the chemical formula of calcium carbonate, which is CaCO3.
  • Step 2: Calculate the molar mass of CaCO3 by adding the atomic masses of its elements: calcium (Ca), carbon (C), and oxygen (O).
  • Step 3: Find the atomic mass of calcium (Ca), which is approximately 40 g/mol.
  • Step 4: Find the atomic mass of carbon (C), which is approximately 12 g/mol.
  • Step 5: Find the atomic mass of oxygen (O), which is approximately 16 g/mol.
  • Step 6: Since there are three oxygen atoms in CaCO3, calculate the total mass of oxygen: 16 g/mol * 3 = 48 g/mol.
  • Step 7: Add the atomic masses together: 40 g/mol (Ca) + 12 g/mol (C) + 48 g/mol (O) = 100 g/mol.
  • Step 8: Use the formula for mass: Mass = moles x molar mass.
  • Step 9: Substitute the values: Mass = 0.5 moles x 100 g/mol.
  • Step 10: Calculate the mass: 0.5 x 100 = 50 g.
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