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Chapter 11: Problem 56

Given some mass \(m\) of a known pure substance, what is the quickest way to determine the number of moles \(n\) you have of the substance?

Short Answer

Expert verified
To determine the number of moles \(n\) of a given mass \(m\) of a known pure substance, follow these steps: (1) Identify the substance and its mass. (2) Determine the molar mass of the substance from the periodic table or a chemical data table. (3) Calculate the number of moles using the formula \(n = \frac{m}{\text{molar mass}}\), with mass in grams and molar mass in grams per mole (g/mol).

Step by step solution

01

Identify the substance and its mass

Determine the identity of the known pure substance and its given mass \(m\). This information should be provided in the problem.
02

Determine the molar mass of the substance

Locate the substance on the periodic table or look in a chemical data table to find its molar mass. The molar mass has units of grams per mole (g/mol).
03

Calculate the number of moles

Use the formula n = (mass of substance) / (molar mass of substance) to calculate the number of moles \(n\) of the substance. Make sure that the mass of the substance (\(m\)) is in grams and that the molar mass has units of grams per mole (g/mol) for the calculation to work properly. With these three steps, you can quickly determine the number of moles \(n\) of a given mass \(m\) of a known pure substance.

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