How To Solve Mole Problems

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Before Chris can use this calcium carbonate in a chemical reaction, Chris needs to know the amount, in moles, of calcium carbonate present in this sample.

Calculate the amount of calcium carbonate in moles present in this impure sample of calcium carbonate.

For example, if you want to calculate the molar mass of Na Cl, or table salt, you add the mass of each element. Therefore the mass of one mole of Na Cl is the mass of Na plus the mass of Cl: Before you can use this equation, you first need to know how many moles of solute are in the solution.

To do this, multiply the mass of solute you have by its molar mass conversion factor.

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Solution Molecules of this compound are comprised of 13 carbon atoms, 18 hydrogen atoms, and 2 oxygen atoms.

Following the approach described above, the average molecular mass for this compound is therefore: Check Your Learning Acetaminophen, C Ionic compounds are composed of discrete cations and anions combined in ratios to yield electrically neutral bulk matter.