convert the mass

Question

Given the exact mass of sample that you weighed out in step 1.1 and 1.2, convert this mass of K3[Fe(C2O4)3]•3H2O into moles of K3[Fe(C2O4)3]•3H2O.

mass:.104 g

initial- 17.8 ml

final- 30.7 ml

volume- 12.9 ml

Answer 1

If your mass of K3[Fe(C2O4)3]•3H2O is 0.104 g, then you can find the moles by using the molar mass of K3[Fe(C2O4)3]•3H2O. I'm not sure the mass is 0.104 or is it 104? The former seems more likely.

Molar mass K3[Fe(C2O4)3]•3H2O = 491.25 g/mol

0.104 g x 1 mol / 491.25 g = 0.0002117 moles = 2.12x10^-4 moles