Question

count the atoms! 5basi₂o₅

Explanation:

Step1: Determine atoms in one unit

In one unit of $BaSi_{2}O_{5}$, there is 1 Ba atom, 2 Si atoms and 5 O atoms. So in one unit, the total number of atoms is $1 + 2+5=8$ atoms.

Step2: Multiply by the coefficient

The coefficient in front of $BaSi_{2}O_{5}$ is 5. So the total number of atoms is $5\times8 = 40$ atoms.

Answer:

40