chemistry question

Question

CaCl2 + Na2C2O4 ⇒ CaC2O4 + NaCl

a. Write a balance equation.

b. Find the molar mass for CaCl2.

c. Find the molar mass of CaC2O4.

d. How many grams of CaC2O4 is produced from 30.0 g of CaCl2.

Please show work

Answer 1

Good morning. Let's go through these four questions one at a time.

a. To balance the equation, notice that the given equation has two atoms of chlorine and two atoms of sodium on the reactant side. However, the product side of the equation initially has only one atom of sodium and one atom of chlorine. Thus, to balance the equation, we can put a coefficient of 2 in front of NaCl.

b. To determine molar masses, you will need a periodic table and a calculator. The given formula shows us that calcium chloride contains one atom of calcium and two atoms of chlorine. We can set up the problem like this:

Ca: 1 X 40.08 g/mol = 40.08 g/mol

Cl: 2 X 35.45 g/mol = 70.90 g/mol

Then add 40.08 g/mol + 70.90 g/mol to get the molar mass of CaCl₂.

(note: periodic tables will vary as to how many decimal places are given for atomic mass...)

c. solve this problem using the same strategy as in problem b.

d. to solve this problem, we need to use three-step stoichiometry...

30.0g CaCl₂ X 1 mol CaCl₂ / 110.98 g/mol X 1 mol CaC₂O₄ / 1 mol CaCl₂ X the molar mass of CaC₂O₄, which you determine in problem c.