In the process of forming helium from hydrogen, the mass defect is 0.5%. What is the energy produced when helium is formed from 1 kg hydrogen? (1 kWh=36×10⁵ J)

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(3) 1.25×10⁸ kWh. Given: 1 kg of hydrogen, a mass defect of 0.5%, and 1 kWh=36×10⁵=3.6×10⁶ J. Idea: only the mass that goes missing becomes energy, through E=Δ mc². Δ m=0.5% of 1 kg=5×10⁻³ kg. E=5×10⁻³×9×10¹⁶=4.5×10¹⁴ J. In kilowatt-hours: (4.5×10¹⁴)/(3.6×10⁶)=1.25×10⁸ kWh.

In the process of forming helium from hydrogen, the mass defect is 0.5%. What is the energy produced when helium is formed from 1 kg hydrogen? (1 kWh=36×10⁵ J)

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