How do I convert grams to moles?

Understand the Problem

The question is asking how to convert a measurement from grams into moles, which involves using the molar mass of the substance to perform the conversion. The approach is to divide the mass in grams by the molar mass of the compound to obtain the number of moles.

Answer

Divide the mass in grams by the molar mass in g/mol.

Steps to Solve

Determine the molar mass of the substance

The molar mass (molecular weight) of a substance is the weight of one mole of that substance in grams per mole (g/mol). This information is usually found on the periodic table or can be calculated by summing the atomic masses of the elements in the compound.

Write down the given mass in grams

Record the mass of the substance that you have, in grams (g).

Use the conversion formula

Convert grams to moles using the formula:

$$ n = \frac{m}{M} $$

where:

$ n $ is the number of moles
$ m $ is the mass in grams
$ M $ is the molar mass of the substance in g/mol

Simply divide the given mass by the molar mass.

Calculate the number of moles

Carry out the calculation from the previous step to find the number of moles. Ensure that the units correctly cancel out, leaving you with the final unit in moles.

To convert grams to moles, divide the mass in grams by the molar mass in g/mol.

More Information

The concept of moles allows chemists to count particles (atoms, molecules, ions) by weighing them, which is practical for laboratory work. One mole contains exactly $6.022 \times 10^{23}$ particles, a concept known as Avogadro's number.

Tips

A common mistake is to forget to correctly look up or calculate the molar mass of the substance, or to mix up the mass and molar mass units. Always ensure that the molar mass you use is appropriately matched to the substance you are converting.

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