Question

for the following formula, match the definition to the numerical value: 4al₂s₃

Explanation:

Step1: Identify element symbol

In the formula $4Al_2S_3$, $Al$ is the symbol for the element aluminum. So, $Al$ matches "Element Symbol".

Step2: Identify coefficient

The number 4 in front of the formula represents the number of formula - units. It is the coefficient. So, 4 matches "Coefficient".

Step3: Identify subscript

The number 3 next to $S$ is a subscript, indicating the number of sulfur atoms in each $Al_2S_3$ unit. So, 3 matches "Subscript".

Step4: Calculate total Al atoms

There are 2 aluminum atoms in each $Al_2S_3$ unit, and there are 4 formula - units. So the total number of Al atoms is $4\times2 = 8$. Thus, 8 matches "Total # of Al atoms".

Step5: Calculate total S atoms

There are 3 sulfur atoms in each $Al_2S_3$ unit, and there are 4 formula - units. So the total number of S atoms is $4\times3=12$. Thus, 12 matches "Total # of S atoms".

Answer:

Al - Element Symbol
4 - Coefficient
3 - Subscript
8 - Total # of Al atoms
12 - Total # of S atoms