Chemistry, 20.01.2020 09:31 jahsehsgold
Arock has 25 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. how long ago was the rock formed? 1.25 billion years ago 2.50 billion years ago 5.00 billion years ago 6.25 billion years ago
Answers: 1
Chemistry, 22.06.2019 18:10
Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)
Answers: 1
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What is the molecular formula of ferrous nitrate and ferric nitrate
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Which example is a mechanical wave? a.microwave b.radio wave c.water wave d.ultraviolet light
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Arock has 25 percent of its original amount of potassium-40 remaining in it; potassium-40 has a hal...
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