there is 4.5 grams of acetic acid in 100 ml of water. how many moles of acetic acid is that?
divide the 4.5 grams of HC2H3O2 by its molar mass
To determine the number of moles of acetic acid, you need to use its molar mass and the given mass. Here's how you can calculate it:
Step 1: Find the molar mass of acetic acid:
Acetic acid (CH3COOH) has the following atomic masses:
C (Carbon): 12.01 g/mol
H (Hydrogen): 1.01 g/mol (there are 2 hydrogen atoms)
O (Oxygen): 16.00 g/mol (there are 2 oxygen atoms)
Now, calculate the molar mass:
Molar mass of acetic acid = (12.01 g/mol x 2) + (1.01 g/mol x 2) + 16.00 g/mol + 1.01 g/mol = 60.05 g/mol
Step 2: Convert grams to moles using the molar mass:
Number of moles = Mass / Molar mass
Given that there are 4.5 grams of acetic acid, we can calculate the number of moles as follows:
Number of moles = 4.5 g / 60.05 g/mol ≈ 0.0749 moles
Therefore, there are approximately 0.0749 moles of acetic acid in 100 ml of water.