When Marie determines chemical composition of pitchblende, 7 minerals add to 99%, one mineral (magnesium oxide) is .99% and the "extraneous matter" of .001% all adds up to 99.991%. Presumably the mag-Ox should be .999%, otherwise, the actual extraneous matter would be 10 times greater (.01%) than Marie's stated measurement.
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05/03/2025 alle ore 08:34
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