A #0.49*g# mass of water is LOST from a mass of #3.75*g# #Fe(NO_3)_3*2H_2O# upon prolonged heating. What is the percentage composition of water with respect to the starting salt?
And so you got a molar quantity of
ANd now you subject this to drying to remove the water.....
And now you still have a
And so in fact you have lost a mass of
Finally we address the percentage of water by mass in the