How many moles are in 4.94 g of salicylic acid if its molar mass is 138.13 g/mol?

To calculate the number of moles of salicylic acid in a given mass, we can use the formula:

Number of moles = Mass (g) / Molar mass (g/mol)

In this case, we have:

• Mass of salicylic acid = 4.94 g
• Molar mass of salicylic acid = 138.13 g/mol

Plugging in the values:

Number of moles = 4.94 g / 138.13 g/mol

Calculating this gives:

Number of moles ≈ 0.0357 moles

So, there are approximately 0.0357 moles of salicylic acid in 4.94 g. This calculation is useful in chemistry, especially when preparing solutions or reactions involving specific quantities of compounds.