Question

Use this chemical equation to answer the question. A + 2b ab2
The molar mass of is a is 8 g . The molar mass of is . b is 12 g Which option
shows the correct molar mass of ?
(1 point)
A + 2B → AB2
A 8 g/mol B 12 g/mol
AB2
20 g/mol
64 g/mol
40 g/mol
32 g/mol

Answer 1

To find the molar mass of the compound \( AB_2 \) from the given reaction \( A + 2B \rightarrow AB_2 \), we need to calculate the molar mass using the molar masses of \( A \) and \( B \).

1. Molar mass of \( A \): 8 g/mol
2. Molar mass of \( B \): 12 g/mol

In the molecular formula \( AB_2 \):
- There is 1 mole of \( A \)
- There are 2 moles of \( B \)

Now we calculate the total molar mass of \( AB_2 \):

\[
\text{Molar mass of } AB_2 = (\text{molar mass of } A) + 2 \times (\text{molar mass of } B)
\]

\[
\text{Molar mass of } AB_2 = 8 \, \text{g/mol} + 2 \times 12 \, \text{g/mol}
\]

\[
\text{Molar mass of } AB_2 = 8 \, \text{g/mol} + 24 \, \text{g/mol} = 32 \, \text{g/mol}
\]

So, the correct molar mass of \( AB_2 \) is **32 g/mol**.