# Ibuprofen, the anti-inflammatory ingredient in Advil, has the formula C13 H18 O2. What is the molar mass of ibuprofen? How many molecules are in 0.200 mole of ibuprofen?

Feb 24, 2016

$206 g / m o l$

$1.2046 \times {10}^{23}$ molecules

#### Explanation:

To find the molar mass of the compound, simply add the molar masses of all the individual atoms that make up 1 molecule of the compound.

$\therefore {M}_{r} = \left(13 \times 12\right) + \left(18 \times 1\right) + \left(2 \times 16\right)$

$= 206 g / m o l$.

$1$ mole contains $6.023 \times {10}^{23}$ particles.

Hence by ratio and proportion, $0.2 m o l$ contains $1.2046 \times {10}^{23}$ molecules.