Questions: What is the formula weight of LiBr ? 72.96 amu 554.6 amu 86.84 amu 11.51 amu 8.687 amu

What is the formula weight of LiBr ? 72.96 amu 554.6 amu 86.84 amu 11.51 amu 8.687 amu
Transcript text: What is the formula weight of LiBr ? 72.96 amu 554.6 amu 86.84 amu 11.51 amu 8.687 amu
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Solution

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Solution Steps

Step 1: Determine the Atomic Weights

To find the formula weight of lithium bromide (LiBr), we need to know the atomic weights of lithium (Li) and bromine (Br). The atomic weight of lithium is approximately 6.94 amu, and the atomic weight of bromine is approximately 79.90 amu.

Step 2: Calculate the Formula Weight

The formula weight of a compound is the sum of the atomic weights of all atoms in its formula. For LiBr, the formula weight is calculated as follows:

\[ \text{Formula weight of LiBr} = \text{Atomic weight of Li} + \text{Atomic weight of Br} = 6.94 \, \text{amu} + 79.90 \, \text{amu} = 86.84 \, \text{amu} \]

Final Answer

The formula weight of LiBr is \(\boxed{86.84 \, \text{amu}}\).

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