Mole Chemistry Example 2

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Example 2

medium
How many moles of water are in 36.036.0 g of H2O\text{H}_2\text{O}? (Molar mass of H2O=18.0 g/mol\text{H}_2\text{O} = 18.0\,\text{g/mol})

Solution

  1. 1
    Use the mass-to-moles formula n=mMn = \frac{m}{M}, where mm is the sample mass and MM is the molar mass.
  2. 2
    Substitute the given values: n=36.0 g18.0 g/moln = \frac{36.0\,\text{g}}{18.0\,\text{g/mol}}.
  3. 3
    Evaluate the quotient: n=2.00 moln = 2.00\,\text{mol} of H2O\text{H}_2\text{O}.

Answer

2.00 mol of H2O2.00\,\text{mol of H}_2\text{O}
The relationship n=mMn = \frac{m}{M} is the most frequently used equation in chemistry for converting between mass and moles.

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 3 easy

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

Example 4 easy

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

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