4. Find the number if molecule in 40 gams of hydrogen peroxide H_(2)O_(2)

To find the number of molecules in 40 grams of hydrogen peroxide (H₂O₂), we need to follow these steps:1. **Calculate the molar mass of H₂O₂:** - Hydrogen (H): 1.01 g/mol - Oxygen ( 16.00 g/mol Molar mass of H₂O₂ = (2 × 1.01) + (2 × 16.00) = 34.02 g/mol2. **Convert grams to moles:** - Moles = Mass / Molar Mass - Moles of H₂O₂ = 40 g / 34.02 g/mol ≈ 1.176 moles3. **Use Avogadro's number to find the number of molecules:** - Avogadro's number = 6.022 × 10²³ molecules/mol Number of molecules = Moles × Avogadro's number Number of molecules = 1.176 moles × 6.022 × 10²³ molecules/mol ≈ 7.08 × 10²³ molecules, there are approximately 7.08 × 10²³ molecules of hydrogen peroxide (H₂O₂) in 40 grams.