Question

part f
calculate the formula mass for copper(i) sulfite.
express your answer in atomic mass units to two decimal places.
formula mass =
​ amu

Explanation:

Step1: Determine the formula of copper(I) sulfite

Copper(I) has a charge of \( +1 \) (\( \text{Cu}^+ \)) and sulfite ion is \( \text{SO}_3^{2-} \). To balance the charges, we need 2 \( \text{Cu}^+ \) ions for 1 \( \text{SO}_3^{2-} \) ion. So the formula is \( \text{Cu}_2\text{SO}_3 \).

Step2: Find atomic masses

• Atomic mass of Cu: \( 63.55 \, \text{amu} \)
• Atomic mass of S: \( 32.07 \, \text{amu} \)
• Atomic mass of O: \( 16.00 \, \text{amu} \)

Step3: Calculate the formula mass

For \( \text{Cu}_2\text{SO}_3 \):

• Mass of Cu: \( 2 \times 63.55 = 127.10 \, \text{amu} \)
• Mass of S: \( 1 \times 32.07 = 32.07 \, \text{amu} \)
• Mass of O: \( 3 \times 16.00 = 48.00 \, \text{amu} \)

Sum these masses: \( 127.10 + 32.07 + 48.00 = 207.17 \, \text{amu} \)

Answer:

\( 207.17 \)