Isopropyl Alcohol (C3H8O) is the active ingredient in hand sanitizer. If I have 125 grams of Isopropyl Alcohol (C3H8O) ...

b. How many Hydrogen atoms are present? (round answer to 1 decimal place)

There are 1*10^25 H atoms present

Explanation:

Step 1: data given

Mass of Isopropyl Alcohol (C3H8O) = 125 grams

Molar mass of Isopropyl Alcohol (C3H8O) = 60.1 g/mol

Number of Avogadro = 6.02 * 10^23 / mol

Step 2: Calculate moles Isopropyl Alcohol

Calculate moles Isopropyl Alcohol = mass C3H8O / molar mass C3H8O

Calculate moles Isopropyl Alcohol = 125 grams / 60.1 g/mol

Calculate moles Isopropyl Alcohol = 2.08 moles

Step 3: Calculate moles of hydrogen

For 1 mol C3H8O we have 8 moles hydrogen

For 2.08 moles we have 8*2.08 = 16.64 moles hydrogen

Step 4: Calculate amount of hydrogen atoms

Hydorgen atoms = moles H * number of Avogadro

Hydrogen atoms = 16.64 moles * 6.02 * 10^23 / mol

Hydorge, atoms = 1*10^25 H atoms

There are 1*10^25 H atoms present