MCQOPTIONS
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				| 1. | 
                                    The heat of combustion of a fuel | 
                            
| A. | is equal to the heat of formation. | 
| B. | is always negative. | 
| C. | can't be known without calculating it. | 
| D. | is always positive. | 
| Answer» C. can't be known without calculating it. | |