What is the molarity if you dissolve 15 g of #FeCl_3# to make up 250 mL solution?

1 Answer
Mar 7, 2016

Answer:

0.37 M

Explanation:

First calculate the molar mass of #FeCl_3#:

#55.85+3*35.45=162.20 g//mol#

Then calculate how many moles are 15 g of #FeCl_3#:

#color(red)(n=m/M#

#n=15/162.20=0.0925 mol#

Then calculate the concentration:

#color(red)(c=n/v#

#n=0.0925mol//0.250L=0.37 mol//L (or 0.37 M)#

The concentration is given with two representative digits which are the same ones of 15 grams.