How many moles are in 150 g of ethanol (C2H5OH)?

To find the number of moles in 150 g of ethanol (C₂H₅OH), we first need to calculate its molar mass.

The molecular formula of ethanol consists of:

• 2 carbon (C) atoms
• 6 hydrogen (H) atoms
• 1 oxygen (O) atom

The molar masses of these elements are approximately:

• Carbon (C): 12.01 g/mol
• Hydrogen (H): 1.008 g/mol
• Oxygen (O): 16.00 g/mol

Now, we can calculate the molar mass of ethanol:

Molar Mass of C₂H₅OH = (2 × 12.01 g/mol) + (6 × 1.008 g/mol) + (1 × 16.00 g/mol)

Molar Mass of C₂H₅OH = 24.02 g + 6.048 g + 16.00 g = 46.068 g/mol

Now, we can calculate the number of moles using the formula:

Number of moles = mass (g) / molar mass (g/mol)

Number of moles = 150 g / 46.068 g/mol ≈ 3.25 moles

Therefore, there are approximately 3.25 moles in 150 g of ethanol.