x previous | 12 of 20 next Exercise 6.52 Part A Hydrogen peroxide, H202, is used

Question

x previous | 12 of 20 next Exercise 6.52 Part A Hydrogen peroxide, H202, is used to disinfect contact lenses. 2 H2O2(aq) 2 H2O(l) + 02(9) You may want to reference (LI page) Section 6.1 How many mililiters of O2(g) at 21 °C and 5.00 barr can be liberated from 19.85 mL of an aqueous solution containing 300% H2O2 by mass? The density of the aqueous solution of H2O2 is 1.01 g/mL. Express your answer in mililiters to three signficant figures. while completing this problem. vo, 0.772 mL My Answers Give Up Incorrect; Try Again; 2 attempts remaining Provide Feedback Continue 23-52 ^q. TUR 16.11.2017 01 DOLL 6

Explanation / Answer

find V of O2

required for

3% mass of H2O2

mass of solution = D*V = 19.85*1.01 = 20.05 g

mass of H2O2 = %/100% * vol = 3/100*20.05 = 0.6015 g of H2O2

mol = mass/MW = 0.6015/34 = 0.017691

mol of O2 required for 0.017691 mol of H2O

2:1

0.017691 mol of H2O --> 1/2*0.017691 = 0.0088455 mol of O2

PV = nRT

V = nRT/P

V = (0.0088455)(0.08314)(21+273)/(5)

V = 0.043242 L

V = 32.24 mL

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