There are 1.92 × 10^23 atoms Mo in the cylinder.
Step 1. Calculate the mass of the cylinder
Mass = 22.0 mL × (8.20 g/1 mL) = 180.4 g
Step 2. Calculate the mass of Mo
Mass of Mo = 180.4 g alloy × (17.0 g Mo/100 g alloy) = 30.67 g Mo
Step 3. Convert grams of Mo to moles of Mo
Moles of Mo = 30.67 g Mo × (1 mol Mo/95.95 g Mo) = 0.3196 mol Mo
Step 4. Convert moles of Mo to atoms of Mo
Atoms of Mo = 0.3196 mol Mo × (6.022 × 10^23 atoms Mo)/(1 mol Mo)
= 1.92 × 10^23 atoms Mo
