Mole Chemistry Example 3

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Example 3

easy
How many moles are in 40.040.0 g of NaOH? (Molar mass = 40.0 g/mol40.0\,\text{g/mol})

Solution

  1. 1
    n=mM=40.040.0=1.00 moln = \frac{m}{M} = \frac{40.0}{40.0} = 1.00\,\text{mol}.
  2. 2
    This means we have 6.022×10236.022 \times 10^{23} formula units of NaOH.

Answer

1.00 mol1.00\,\text{mol}
When the mass equals the molar mass, you have exactly one mole of the substance.

About Mole

The fundamental counting unit in chemistry, defined as exactly 6.022×10236.022 \times 10^{23} particles (atoms, molecules, ions, or other entities).

Learn more about Mole →

More Mole Examples

Example 1 easy

What is a mole and why is it useful in chemistry?

Example 2 medium

How many moles of water are in [formula] g of [formula]? (Molar mass of [formula])

Example 4 easy

A sample contains [formula] molecules of ammonia. How many moles of [formula] is this?

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