# How many moles are present in 34 grams of Cu(OH)_2?

Feb 18, 2016

Approx. $\frac{1}{3}$ of a mole.

#### Explanation:

$\text{Moles of}$ $C u {\left(O H\right)}_{2}$ $=$ $\frac{34 \cdot \cancel{g}}{97.6 \cdot \cancel{g} \cdot m o {l}^{-} 1}$ $=$ ??" moles".

How many formula units of $C u {\left(O H\right)}_{2}$ are in this quantity?

Feb 18, 2016

There are 0.348 moles in 34 grams of $C u {\left(O H\right)}_{2}$

#### Explanation:

Number of moles = $M a s s / M o l a r M a s s$
Molar mass of $C u {\left(O H\right)}_{2}$
Cu - 63.55
O - 2(16)
H - 2(1.01)
= 97.57g/mol
Thus
$34 / 97.57$
$= 0.348$
Thus, there are 0.348 moles in 34 grams of $C u {\left(O H\right)}_{2}$