Question

How many grams of calcium chloride were used if 2.072 grams of calcium oxalate monohydrate were produced, assuming a 100% yield. This means all of the calcium chloride was converted to calcium oxalate monohydrate. Report your answer to 3 decimal places in grams.

Answer 1

The balanced equation is

CaCl2.2H2O+K2C2O4.H2O----->CaC2O4.H2O+2KCl+2H2O

From the above equation, 1 mole of calcium chloride produces 1 mol of calcium oxalate.

Now find the moles of calcium chloride.

Molar mass of calcium chloride=147 g/mol and

given mass =2.072 g,

Number of moles=2.072 g/147 g/mol=0.0140 moles.

Therefore moles of calcium oxalate=0.0140 moles

Molar mass of calcium oxalate=166.2 g/mol

Mass of calcium oxalate=molesxmolar mass=0.0140molx166.2g/mol=2.342 g.