Question

Question #806cd

Answer 1

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 `Ca(OH)_2` weighs
`40.078 + 15.999*2 + 1.008*2 = 74.092g`

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