Calculate the number of moles in each of the following:

0.150 g of salicylic acid

0.30 mL of acetic anhydride (density = 1.08 g/mL)

Molar mass of salicylic acid: C6H4(OH)CO2H = 138.12074 g/mol

acetic anhydride: Molecular formula, C4H6O3. Molar mass, 102.09 g/mol

You should be able to take it from there.

To calculate the number of moles, we use the formula:

Number of moles = mass (in grams) / molar mass

1. For 0.150 g of salicylic acid:

First, we need to find the molar mass of salicylic acid. The molar mass is the sum of the atomic masses of all the elements in the compound.

The chemical formula of salicylic acid is C7H6O3.

The atomic masses of carbon (C), hydrogen (H), and oxygen (O) are:

- Carbon (C) = 12.01 g/mol
- Hydrogen (H) = 1.01 g/mol
- Oxygen (O) = 16.00 g/mol

Now, we can calculate the molar mass of salicylic acid:

Molar mass = (7 * Carbon) + (6 * Hydrogen) + (3 * Oxygen)
= (7 * 12.01 g/mol) + (6 * 1.01 g/mol) + (3 * 16.00 g/mol)
= 138.12 g/mol

Using the formula, we can find the number of moles:

Number of moles = 0.150 g / 138.12 g/mol
≈ 0.001086 moles

Therefore, there are approximately 0.001086 moles in 0.150 g of salicylic acid.

2. For 0.30 mL of acetic anhydride:

First, we need to convert the volume from milliliters (mL) to grams (g) using the given density.

Density = mass / volume

Rearranging the equation, we get:

Mass = Density × Volume

Mass = 1.08 g/mL × 0.30 mL
= 0.324 g

Now, we can calculate the number of moles using the molar mass of acetic anhydride.

The chemical formula of acetic anhydride is (CH3CO)2O.

The molar mass of acetic anhydride is the sum of the atomic masses of carbon, hydrogen, and oxygen:

Molar mass = (2 * Carbon) + (6 * Hydrogen) + (1 * Oxygen)
= (2 * 12.01 g/mol) + (6 * 1.01 g/mol) + (1 * 16.00 g/mol)
= 102.09 g/mol

Using the formula, we can find the number of moles:

Number of moles = 0.324 g / 102.09 g/mol
≈ 0.00317 moles

Therefore, there are approximately 0.00317 moles in 0.30 mL of acetic anhydride.