Question

21 multiple choice 1 point how many total atoms make up 2ba(io₃)₂? 18 16 9 10

Explanation:

Step1: Analyze the formula

For the compound $Ba(IO_3)_2$, first consider the number of atoms in one unit.

• Barium ($Ba$): There is 1 $Ba$ atom.
• Iodine ($I$): Since there is a sub - script 1 outside the parentheses for $I$ in $IO_3$, and we have 2 units of $IO_3$ due to the outer sub - script 2, the number of $I$ atoms is $1\times2 = 2$.
• Oxygen ($O$): In one $IO_3$ unit, there are 3 $O$ atoms. With 2 units of $IO_3$, the number of $O$ atoms is $3\times2=6$.

So, in one unit of $Ba(IO_3)_2$, the total number of atoms is $1 + 2+6=9$.

Step2: Calculate for 2 units

We have 2 units of $Ba(IO_3)_2$. So the total number of atoms is $2\times9 = 18$.

Answer:

18 (corresponding to the first option)