Question

Use this chemical equation to answer the question.

A+2B→AB2


The molar mass of A
is 8 g/mol
. The molar mass of B
is 12 g/mol
. Which option shows the correct molar mass of AB2
?

(1 point)
Responses

64 g/mol
64 grams per mole

40 g/mol
40 grams per mole

20 g/mol
20 grams per mole

32 g/mol

Answer 1

To find the molar mass of the compound AB2, we need to consider the contributions of the molar masses of elements A and B in the equation:

1. The molar mass of A is given as 8 g/mol.
2. The molar mass of B is given as 12 g/mol. Since there are 2 B atoms in the compound AB2, we need to account for this in the calculation.

Now we can calculate the molar mass of AB2:

\[
\text{Molar mass of AB2} = \text{Molar mass of A} + 2 \times \text{Molar mass of B}
\]

\[
\text{Molar mass of AB2} = 8 \, \text{g/mol} + 2 \times 12 \, \text{g/mol}
\]

\[
\text{Molar mass of AB2} = 8 \, \text{g/mol} + 24 \, \text{g/mol}
\]

\[
\text{Molar mass of AB2} = 32 \, \text{g/mol}
\]

Therefore, the correct option for the molar mass of AB2 is **32 g/mol**.