Question: The recoverable U S reserves of high grade uranium 238 ore high grade
The recoverable U. S. reserves of high-grade uranium-238 ore (high-grade ore contains about 10 kg of 238U3O8 per ton) are estimated to be about 500,000 tons. Neglecting any geological changes, what mass of 238U existed in this high-grade ore when the Earth was formed, about 4.8 billion years ago?
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