Lecture 1610/7/05 Research club Friday 11:30 am. Quiz 5 1. In August 1986, 1700 people died from asphyxiation in the Lake Nyos valley as a result of the.

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Lecture 1610/7/05 Research club Friday 11:30 am

Quiz 5 1. In August 1986, 1700 people died from asphyxiation in the Lake Nyos valley as a result of the lake’s massive release of carbon dioxide that blanketed the valley. Calculate the density of CO 2 (44 g/mol) at 1 atm and 298 K. 2. Air has an average molar mass of g/mol. Does this seem reasonable given the composition of the atmosphere? Explain.

A flask contains 1.00 L of a pure gas at atm and 20˚C. The mass of the gas is 1.13 g. What is the molar mass of the gas? What is its identity?

2 H 2 O 2 (liq) ---> 2 H 2 O(g) + O 2 (g) Decompose 1.1 g of H 2 O 2 in a flask with a volume of 2.50 L. What are the pressure of O 2 and H 2 O at 25 o C?

2 H 2 O 2 (liq)  2 H 2 O(g) + O 2 (g) 1.1 g mol ÷ 34 g/mol mol atm

2 H 2 O 2 (liq)  2 H 2 O(g) + O 2 (g) 1.1 g ÷ 34 g/mol mol mol O atm

Octane (C 8 H 18 ) is one of the hydrocarbons in gasoline. What volume of oxygen entering the engine at 0.95 atm and 20˚C is required to burn 1.00 g octane?

Dalton’s Law of Partial Pressure

2 closed 1.0 L vessels contain 1 atm Br 2 (g) and 1 atm F 2 (g), respectively. When they are allowed to mix, they react to form BrF 5 (g). Assume that the temperature does not change. What is the pressure after the final reaction?