# Question #806cd

Feb 25, 2016

740g

#### Explanation:

The molecular mass of
Calcium = 40.078
Oxygen = 15.999
Hydrogen = 1.008

There are two Hydrogen atoms and two Oxygen atoms

So one mole of $C a {\left(O H\right)}_{2}$ weighs
$40.078 + 15.999 \cdot 2 + 1.008 \cdot 2 = 74.092 g$

Therefore 10 moles weighs $740.92 g$ or, rounded to the nearest 10, $740 g$