Suppose you want a mixture that contains 2.5 grams of iron ion and three times as many moles of oxalate ion as moles of iron. If the iron comes from iron(iii)chloride and the oxalate ion from K2C2O4, how many grams of each of the compounds should you combine?
Note iron(III) is written with capital Is and not lower case is.
2.5 g Fe/55.85 = xx moles Fe you need. (I have rounded here. You should go through and be a little more accurate. I will round down the line, too, so it will be necessary for you to through all of the calculations for a better answer.) 3 x moles Fe = moles oxalate ions = ?? moles oxalate.
xx moles Fe x (1 mol FeCl3/1 mole Fe) = moles FeCl3 and that times molar mass = grams FeCl3.
?? moles oxalate x (1 mol K2C2O4/1 mole C2O4) = moles K2C2O4 and that times molar mass K2C2O4 = g K2C3O4.
Check my thinking. Check my work.
I made a typo, next to last line, should be molar mass K2C2O4 = g K2C2O4 instead of what follows.
molar mass K2C2O4 = g K2C3O4.
Check my thinking. Check my work.
To determine the grams of each compound required in the mixture, we'll follow these steps:
1. Calculate the moles of iron ions required using the given mass of iron ions.
2. Determine the moles of oxalate ions required using the moles of iron ions.
3. Calculate the mass of iron(III) chloride required using the moles of iron ions.
4. Determine the mass of potassium oxalate required using the moles of oxalate ions.
Let's calculate step by step:
Step 1: Calculate the moles of Iron (Fe) ions required
Given mass of Iron (Fe) ions = 2.5 grams
The atomic mass of iron (Fe) is approximately 55.85 g/mol.
Moles of iron (Fe) ions = Mass of iron (Fe) ions / Molar mass of iron (Fe)
Moles of iron (Fe) ions = 2.5 g / 55.85 g/mol
Step 2: Determine the moles of Oxalate ions (C2O4^2-) required
Moles of oxalate ions = 3 * moles of iron (Fe) ions
Step 3: Calculate the mass of Iron(III) chloride (FeCl3) required
The molar mass of Iron(III) chloride (FeCl3) is approximately 162.2 g/mol.
Mass of Iron(III) chloride (FeCl3) = Moles of iron (Fe) ions * Molar mass of Iron(III) chloride (FeCl3)
Step 4: Determine the mass of Potassium Oxalate (K2C2O4) required
The molar mass of Potassium Oxalate (K2C2O4) is approximately 138.21 g/mol.
Mass of Potassium Oxalate (K2C2O4) = Moles of oxalate ions * Molar mass of Potassium Oxalate (K2C2O4)
Now you have the mass of Iron(III) chloride (FeCl3) and Potassium Oxalate (K2C2O4) required to create the desired mixture.