1. Find the molar mass of acetone (C₃H₆O):
* Carbon (C): 12.01 g/mol * 3 = 36.03 g/mol
* Hydrogen (H): 1.01 g/mol * 6 = 6.06 g/mol
* Oxygen (O): 16.00 g/mol * 1 = 16.00 g/mol
Total Molar Mass: 36.03 + 6.06 + 16.00 = 58.09 g/mol
2. Convert grams of acetone to moles:
* Moles = (grams of acetone) / (molar mass of acetone)
* Moles = 0.435 g / 58.09 g/mol = 0.00749 mol
3. Use Avogadro's number to find the number of molecules:
* Avogadro's Number: 6.022 x 10²³ molecules/mol
* Number of molecules = (moles of acetone) * (Avogadro's number)
* Number of molecules = 0.00749 mol * 6.022 x 10²³ molecules/mol
* Number of molecules ≈ 4.51 x 10²¹ molecules
Therefore, there are approximately 4.51 x 10²¹ molecules of acetone present in 0.435 g of acetone.
