I realllyy need help with this:

39. Find the formula mass for AI2S3. Show your work. (The 2 and 3 are small)

Thanks
-MC

You look up the atomic masses of Al, and S.

formula mass=2*atomicmassAl + 3*atomicmassS

I will be happy to critique your work.

http://www.webelements.com/index.html

...I got 150.158077...

-MC

correct.

:D

Thanks!!!!
-MC

To find the formula mass for AI2S3, you'll need to determine the atomic masses of the elements involved and then calculate the sum of their masses.

Step 1: Determine the atomic masses of the elements.

The atomic mass of each element can be found on the periodic table. For AI (aluminum), the atomic mass is approximately 26.98 grams per mole, and for S (sulfur), the atomic mass is approximately 32.06 grams per mole.

Step 2: Determine the number of atoms for each element.

The subscript numbers in the formula indicate the number of atoms for each element. In this case, AI2S3 indicates that there are 2 aluminum atoms and 3 sulfur atoms.

Step 3: Calculate the formula mass.

To calculate the formula mass, multiply the atomic mass of each element by the number of atoms for that element, and then sum up the results.

For AI2S3:
(2 x atomic mass of AI) + (3 x atomic mass of S)
= (2 x 26.98) + (3 x 32.06)
= 53.96 + 96.18
≈ 150.14 grams per mole

Therefore, the formula mass for AI2S3 is approximately 150.14 grams per mole.