Question

The atomic mass of carbon is 12.01, sodium is 22.99, and oxygen is 16.00. What is the molar mass of sodium oxalate (Na2C2O4)?
A.
134.00g
B.
133.00 g
C.
50.91 g
D.
66.91 g
E.
121.81 g

Answer 1

To calculate the molar mass of sodium oxalate (Na₂C₂O₄), we can break it down into its individual components:

1. Sodium (Na): There are 2 sodium atoms.
\[
2 \times 22.99 \, \text{g/mol} = 45.98 \, \text{g/mol}
\]

2. Carbon (C): There are 2 carbon atoms.
\[
2 \times 12.01 \, \text{g/mol} = 24.02 \, \text{g/mol}
\]

3. Oxygen (O): There are 4 oxygen atoms.
\[
4 \times 16.00 \, \text{g/mol} = 64.00 \, \text{g/mol}
\]

Now, we add these values together to find the total molar mass of sodium oxalate:
\[
\text{Molar mass of Na}_2\text{C}_2\text{O}_4 = 45.98 \, \text{g/mol} + 24.02 \, \text{g/mol} + 64.00 \, \text{g/mol} = 134.00 \, \text{g/mol}
\]

Thus, the molar mass of sodium oxalate (Na₂C₂O₄) is **134.00 g/mol**, so the correct answer is:

**A. 134.00 g**