Question

What is the molecular mass of $ \text{Na}_2\text{SO}_4 $?

• A. \( 142 \, \text{g/mol} \)
• B. \( 120 \, \text{g/mol} \)
• C. \( 158 \, \text{g/mol} \)
• D. \( 98 \, \text{g/mol} \)

Hint:

Remember: To calculate the molecular mass, add the atomic masses of all the elements in the compound, considering the number of atoms of each element.