Answer
$4.05$ g of $H_2O$
Work Step by Step
1. Determine the molar mass of this compound ($H_2O$):
$H: 1.008g * 2= 2.016g $
$O: 16.00g$
$16.00g + 2.016g$ = 18.02g
2. Use this as a conversion factor to find the mass in grams:
$0.225 mole \times \frac{18.02g}{1mol} = 4.05g$
