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Uranium-238 decays to thorium and helium according to the reaction 238U→234Th+4He. How much energy is released when 1.00 kg of uranium-238 decays? Compare this amount with the energy released when 1.00 kg of coal is burned (approximately 30 MJ). The atomic masses are mU=395.292599×10−27kg, mTh=388.638509×10−27kg, and mHe=6.646478×10−27kg.
Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancercausing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances. How many atoms of hydrogen are in 1.0 mole of dimethylnitrosamine?