# Coal often contains sulfur (S) as an impurity that is released as gaseous SO 2 during combustion, and SO 2 is one of six primary air pollutants monitored by the EPA. The U.S. Clean Air Act limits sulfur emissions from large coal-fired boilers to 0.54 kilograms (1.2 pounds) of sulfur per million Btus (British thermal units) of heat generated. (1 metric ton = 1,000 kilograms = 2,200 pounds = 1.1 ton; 1 kilogram = 2.2 pounds.) Given that coal burned in power plants has a heating value of 27.5 million Btus per metric ton (25 million Btus per ton), determine the number of kilograms (and pounds) of coal needed to produce 1 million Btus of heat.

### Environmental Science (MindTap Cou...

15th Edition
G. Tyler Miller + 1 other
Publisher: Cengage Learning
ISBN: 9781305090446

### Environmental Science (MindTap Cou...

15th Edition
G. Tyler Miller + 1 other
Publisher: Cengage Learning
ISBN: 9781305090446

#### Solutions

Chapter
Section
Chapter 15, Problem 1DA
Textbook Problem
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## Coal often contains sulfur (S) as an impurity that is released as gaseous SO2 during combustion, and SO2 is one of six primary air pollutants monitored by the EPA. The U.S. Clean Air Act limits sulfur emissions from large coal-fired boilers to 0.54 kilograms (1.2 pounds) of sulfur per million Btus (British thermal units) of heat generated. (1 metric ton = 1,000 kilograms = 2,200 pounds = 1.1 ton; 1 kilogram = 2.2 pounds.)Given that coal burned in power plants has a heating value of 27.5 million Btus per metric ton (25 million Btus per ton), determine the number of kilograms (and pounds) of coal needed to produce 1 million Btus of heat.

Expert Solution
To determine

The number of kilograms of coal required to produce 1 million Btus of heat if the heating value of coal burned in power plants is 27.5 million Btus per metric ton.

### Explanation of Solution

Sulfur is a pollutant that is released in the form of SO2 gas from the burning of coal. The emission of 0.54 kg of sulfur is limited by the Clean Air Act to generate 1 million Btus of heat.

The given information about the problem is as follows:

1 metric ton = 1,000 kg

The heating value of the coal used by electric power plants is:

27.5 million Btus1000 kg=27.5×106 Btus1000 kg

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