Question

3. The density of 30 % (w/w) aqueous hydrogen peroxide (H2O2, MW = 38 g/mole) is 1.05 g/mL. Recall that this solution consists of H2O2 and water (a) What's the molarity (M) of 30 % (w/w) aqueous hydrogen peroxide? (20 points) a. 7.29 b. 8.29 C. 9.29 d. 10.29 e. 11.29 (b) How much volume (mL) of 30 % (w/w) hydrogen peroxide (H2O2, MW = 38 g/mole) is required if you want to prepare 1.0 M of 1000 ml solution? (20 points) a. 90.63 mL b. 100.63 mL C. 110.63 mL d. 120.63 mL e. 130.63 mL

Answer 1

19/88x100 - 0.829 . As we knows Molarity define as no of moles of solute dissolue in I Litre of solution, so 30% w/w 402 means 30g in loog of water solution Density = llosgland & Milo 38 g/mole volume of solution - 100 = 95.238 mL Percentage concentration of H₂O2 (w/v) = 30 x 100 = 31.50 gm 95.238 No. of moles = 31.50 - 0.829 moles Molarity = 0.829 x 1000 _ 8.29 M 1.os 38.0 100 ma Ateluis , - ну, As we know molarity of 30% (w/w) Ho, is 8.29 mso- Miv, = H₂V, (30% w/w to sola) = for 10 m solution 8.2948 x = IMX loud x= 120.63mL 120.63 mL of 30% w/w H₂O₂ solution taken in Hask and it make up to 1000 mL using water. Ang= d