How many grams of hydrogen peroxide (h2o2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)? (recall that the density of water is 1.0 gram/ml.) 0.059 g 30. g 68 g 68,000 g

You must add 68 g H_2O_2 to 1500 mL water.

Step 1. Calculate the mass of water

Mass of water = 1500 mL × 1.0 g/1 mL 1500 g = 1.50 kg

Step 2. Calculate the moles of H_2O_2.

Moles of H_2O_2 = 1.500 kg water × 1.33 mol H_2O_2/1 kg water

= 2.00 mol H_2O_2

Step 3. Calculate the mass of H_2O_2

Mass of H_2O_2 = 2.00 mol H_2O_2 × 34.01 g H_2O_2/1 mol H_2O_2

= 68 g H_2O_2