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How many moles are in 100 grams of CaCO3?

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Question: How many moles are in 100 grams of CaCO3?

Options:

  1. 1
  2. 2
  3. 0.5
  4. 0.25

Correct Answer: 1

Solution: 

Molar mass of CaCO3 = 40 + 12 + 3*16 = 100 g/mol. Number of moles = mass/molar mass = 100 g / 100 g/mol = 1 mole.

How many moles are in 100 grams of CaCO3?

Practice Questions

Q1
How many moles are in 100 grams of CaCO3?
  1. 1
  2. 2
  3. 0.5
  4. 0.25

Questions & Step-by-Step Solutions

How many moles are in 100 grams of CaCO3?
Correct Answer: 1 mole
  • Step 1: Identify the chemical formula of the compound, which is CaCO3 (calcium carbonate).
  • 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. Since there are 3 oxygen atoms in CaCO3, multiply 16 g/mol by 3.
  • Step 6: Add the atomic masses together: 40 g/mol (Ca) + 12 g/mol (C) + 48 g/mol (3*O) = 100 g/mol.
  • Step 7: Use the formula for calculating moles: Number of moles = mass / molar mass.
  • Step 8: Substitute the values: Number of moles = 100 g / 100 g/mol.
  • Step 9: Calculate the result: Number of moles = 1 mole.
  • 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 determine the number of moles from a given mass using the formula: moles = mass / molar mass.
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