Question

part b
calculate the formula mass for barium iodide.
express your answer in atomic mass units to two decimal places.
formula mass =
\boxed{} amu

Explanation:

Step1: Determine the formula of barium iodide

Barium (Ba) has a charge of +2, and iodide (I⁻) has a charge of -1. To form a neutral compound, the formula is \( \text{BaI}_2 \).

Step2: Find the atomic masses

The atomic mass of Ba is approximately 137.33 amu, and the atomic mass of I is approximately 126.90 amu.

Step3: Calculate the formula mass

For \( \text{BaI}_2 \), we calculate the sum of the atomic masses:
Formula mass = (Atomic mass of Ba) + 2×(Atomic mass of I)
\( = 137.33 + 2\times126.90 \)
\( = 137.33 + 253.80 \)
\( = 391.13 \) amu

Answer:

391.13