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.)
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Answer:
68 gm of hydrogen peroxide (H2O2)
Explanation:
You must add 68 g H_20_2 to 1500 mL water.
Step 1. Calculate the mass of water
Mass of water = 1500 mL x 1.0 g/1 mL 1500 g = 1.50 kg
Step 2. Calculate the moles of H_20_2.
Moles of H_20_2= 1.500 kg water × 1.33
mol H_20_2/1 kg water
= 2.00 mol H_20_2
Step 3. Calculate the mass of H_20_2
Mass of H_20_2= 2.00 mol H_20_2 x 34.01 g H_20_2/1 mol H_20_2
= 68 g H_20_2 (ans)
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