The correct word for the given statement should be determined. Concept Introduction: The effect of temperature on plastics is complex in nature. When heated, plastics become flexible before finally melting. However, upon cooling it can regain its rigidity and may become hard yet brittle. This is due to the present of amorphous and crystalline regions. Amorphous regions represent the phase when the polymeric chains are not arranged in an organized manner. Similarly, crystalline regions represent the phase when polymeric chains are well organized. A crystalline plastic may transit from strictly crystalline to amorphous state under constant heating.

Question

Propane is burned completely with excess oxygen. The product gas contains 24.5 mole% CO2, 6.10% CO, 40.8% H2O, and 28.6% O2. (a) Calculate the percentage excess O2 fed to the furnace. (b) A student wrote the stoichiometric equation of the combustion of propane to form CO2 and CO as: 2C3H8 + 11O2 → 3CO2 + 3CO + 8H2O According to this equation, CO2 and CO should be in a ratio of 1/1 in the reaction products, but in the product gas of Part (a) they are in a ratio of 24.8/6.12. Is that result possible? (Hint: Yes.) Explain how

Answer 1

Question

Chapter 3, Problem 3.8Q

Interpretation Introduction

Interpretation:

The correct word for the given statement should be determined.

Concept Introduction:

The effect of temperature on plastics is complex in nature. When heated, plastics become flexible before finally melting. However, upon cooling it can regain its rigidity and may become hard yet brittle. This is due to the present of amorphous and crystalline regions. Amorphous regions represent the phase when the polymeric chains are not arranged in an organized manner. Similarly, crystalline regions represent the phase when polymeric chains are well organized. A crystalline plastic may transit from strictly crystalline to amorphous state under constant heating.

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Propane is burned completely with excess oxygen. The product gas contains 24.5 mole% CO2, 6.10% CO, 40.8% H2O, and 28.6% O2. (a) Calculate the percentage excess O2 fed to the furnace. (b) A student wrote the stoichiometric equation of the combustion of propane to form CO2 and CO as: 2C3H8 + 11O2 → 3CO2 + 3CO + 8H2O According to this equation, CO2 and CO should be in a ratio of 1/1 in the reaction products, but in the product gas of Part (a) they are in a ratio of 24.8/6.12. Is that result possible? (Hint: Yes.) Explain how

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