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				| 1. | A 250L rigid tank contains methane at 1500 kPa, 500 K. It is now cooled down to 300K. Find the heat transfer. | 
| A. | 402.4 kJ | 
| B. | 502.4 kJ | 
| C. | 602.4 kJ | 
| D. | 702.4 kJ | 
| Answer» C. 602.4 kJ | |