Part A Write and balance the chemical reaction. ( Note: catalysts do not appear

Question

Part A

Write and balance the chemical reaction. (Note: catalysts do not appear in balanced chemical equations)

Express your answer as a chemical equation. Identify all of the phases in your answer.

2H2O2(l)2H2O(l)+O2(g)

Part B

What is the partial pressure of oxygen collected over the water?

Express your answer to one decimal place and include the appropriate units.

Hydrogen peroxide (H2O2) decomposes in the presence of a catalyst to form water and oxygen. The catalyst was added to 5.80 mL of a hydrogen peroxide solution at 20.0 C, and 50.0 mL of gas was collected over water at a total pressure of 764.0 mmHg. Look up the vapor pressure of water under these conditions in the table. Vapor pressure of water versus temperature Temperature (C) Pressure (mmHg) Temperature (C) Pressure (mmHg) 0 4.58 55 118.2 5 6.54 60 149.6 10 9.21 65 187.5 15 12.79 70 233.7 20 17.55 75 289.1 25 23.78 80 355.1 30 31.86 85 433.6 35 42.23 90 525.8 40 55.40 95 633.9 45 71.97 100 760.0 50 92.60

Part A

Write and balance the chemical reaction. (Note: catalysts do not appear in balanced chemical equations)

Express your answer as a chemical equation. Identify all of the phases in your answer.

2H2O2(l)2H2O(l)+O2(g)

Part B

What is the partial pressure of oxygen collected over the water?

Express your answer to one decimal place and include the appropriate units.

Explanation / Answer

if T = 20°C, then from the list,

Pvapor = 17.55 mm Hg

then

Poxygen = Ptotal - PVapor = 764-17.55 = 746.45 mm Hg of O2

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