Final answer:
The number of moles in 213g of calcium carbonate is calculated by dividing the mass of the calcium carbonate by its molar mass (100.09 g/mol). The result is approximately 2.13 moles.
Step-by-step explanation:
To calculate the number of moles in 213g of calcium carbonate (CaCO₃), you first need to know the molar mass of CaCO₃. The molar mass is the sum of the atomic masses of each element in the compound, which are obtained from the periodic table. For CaCO₃, the molar mass is approximately 40.08 g/mol (calcium) + 12.01 g/mol (carbon) + 3*16.00 g/mol (oxygen) = 100.09 g/mol.
Using the molar mass, you can convert grams to moles using the formula:
Number of moles = Mass (g) ÷ Molar mass (g/mol)
In this case:
Number of moles of CaCO₃ = 213 g ÷ 100.09 g/mol = 2.13 moles (rounded to two decimal places)
Therefore, 213g of CaCO₃ is equivalent to approximately 2.13 moles of calcium carbonate.