calculate the δh∘ for this reaction using the following thermochemical data: ch4(g)+2o2(g)⟶co2(g)+2h2o(l) δh∘=−890.3kj c2h4(g)+h2(g)⟶c2h6(g) δh∘=−136.3kj 2h2(g)+o2(g)⟶2h2o(l) δh∘=−571.6kj 2c2h6(g)+7o2(g)⟶4co2(g)+6h2o(l) δh∘=−3120.8kj

What percentage of the earth's water is available for use by living things?

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In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.