A sample of CaCl2⋅2H2O/K2C2O4⋅H2O solid salt mixture is dissolved in ~150 mL

de-ionized H2O. The oven dried precipitate has a mass of 0.253 g.
The limiting reactant in the salt mixture is K2C2O4⋅H2O. Determine Mass of K2C2O4⋅H2O(aq) in Salt Mixture in grams.

CaC2O4 = 0.253 g

0.253 x (molar mass K2C2O4.H2O/molar mass CaC2O4) = ? g K2C2O4.H2O

.362425

464

To determine the mass of K2C2O4⋅H2O(aq) in the salt mixture, we need to determine the moles of K2C2O4⋅H2O that reacted.

1. Calculate the molar mass of K2C2O4⋅H2O (potassium oxalate monohydrate).
- The molar mass of K2C2O4 = (2 * atomic mass of K) + atomic mass of C2O4
- The molar mass of H2O = (2 * atomic mass of H) + atomic mass of O
- Add the masses of K2C2O4 and H2O to get the molar mass of K2C2O4⋅H2O.

2. Convert the mass of the oven-dried precipitate to moles using the molar mass of K2C2O4⋅H2O.

3. Since K2C2O4⋅H2O is the limiting reactant, it completely reacts with CaCl2⋅2H2O in a 1:1 ratio. This means that the moles of K2C2O4⋅H2O reacted is equal to the moles of CaCl2⋅2H2O in the salt mixture.

4. Convert the moles of CaCl2⋅2H2O to grams using the molar mass of CaCl2⋅2H2O.

Here is an example calculation:

1. The molar mass of K2C2O4:
- The molar mass of K = 39.10 g/mol
- The molar mass of C2O4 = (2 * atomic mass of C) + (4 * atomic mass of O)
- The atomic mass of C is 12.01 g/mol, and the atomic mass of O is 16.00 g/mol.
- Add the masses together to get the molar mass of K2C2O4.
- The molar mass of H2O = 18.02 g/mol (this can be assumed since water has a constant molar mass).

So, the molar mass of K2C2O4⋅H2O is the sum of the molar masses of K2C2O4 and H2O.

2. Convert the mass of the oven-dried precipitate to moles using the molar mass of K2C2O4⋅H2O.
- Divide the mass of the oven-dried precipitate (0.253 g) by the molar mass of K2C2O4⋅H2O.

3. Since K2C2O4⋅H2O is the limiting reactant, the moles of K2C2O4⋅H2O reacted is equal to the moles of CaCl2⋅2H2O in the salt mixture.

4. Convert the moles of CaCl2⋅2H2O to grams using the molar mass of CaCl2⋅2H2O.
- Multiply the moles of CaCl2⋅2H2O by the molar mass of CaCl2⋅2H2O to obtain the mass in grams.

Following these steps will give you the mass of K2C2O4⋅H2O(aq) in the salt mixture in grams.