1. Convert pounds to grams:

* 1.5 lb * 454 g/lb = 681 g of peroxide

2. Calculate the mass of hydrogen in the peroxide:

* 681 g * 0.0593 = 40.4 g of hydrogen

3. Convert grams of hydrogen to moles:

* 40.4 g / 1.008 g/mol (molar mass of hydrogen) = 40.1 mol of hydrogen

4. Calculate the number of hydrogen atoms:

* 40.1 mol * 6.022 x 10^23 atoms/mol (Avogadro's number) = 2.42 x 10^25 hydrogen atoms

Therefore, there are approximately 2.42 x 10^25 hydrogen atoms present in 1.5 lb of peroxide.