posted by Marta .
A mixture contains only NaCl and Fe(NO3). A 0.456g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Fe(OH)3. The precipitate is filtered, dried and weighed. Its mass is 0.107g. Calculate the following:
a. the mass of the iron in the sample
b. mass of Fe(NO)3.
How do I work out this question? Thank you.
for the mass of iron, take the percent composition of iron in iron hydroxide times the mass.
for the mass of feNO3, you have the mass of iron, use percentage composition agian to get the mass of the iron nitrate.
thank you so much for your help!