Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 6, Problem 1DAA
Summary Introduction

To determine: How much energy did the ethanol produced from one hectare of corn yield and how much energy did it took to grow the corn.

Concept introduction: The plants and other organic material, other than fossils, can also be used as a source of energy. The oils, gases, and alcohols made from these materials are called biofuels. The crops such as corn and others that are rich in oils, starch, and sugars can easily be transformed into biofuels.

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Question 4. Why nature derived carbons are good materials as com- pared to biochar? Write the main biological precursors for na- ture derived carbons, and describe the preparation of nature de- rived carbons from plant derived precursors (Corn straws waste).
Azlina wanted to maximize the bio-char yield in her experiment so that she can utilize the biochar in the subsequent pot trials to improve the crop yield. She decided to run a torrefaction reaction on biomass at a moderate temperature of 240 oC whereby the biochar yield was 20 wt%. Later on, she found out that biochar can be produced by pyrolysis with a higher yield of 40 wt% but operating at a higher temperature of 500 oC. The amount of biochar yield almost doubled from her yield from the torrefaction process. Explain whether any error involved in her experiment, then describe the error involved and suggest the method to improve the biochar yield.
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