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How many moles of magnesium is 3.01 x10^22 atoms of magnesium?
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What element has similar physical and chemical properties as boron.
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What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?
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The half-life of francium-212 is 19 minutes. How many minutes will it take for 1 gram of this isotop...
History, 09.12.2019 19:31