Se someten a combustión 0,452 g de un compuesto de c, h y n de masa molecular 80. Al recoger el co2 y el h2o producidas obtenemos 0,994 g y 0,203 g respectivamente. Determinen su fórmula empírica y su fórmula molecular.

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Which statements about the two fossil images are correct? 1. cave bears are ancestors of plateosaurus. 2. plateosaurus were present on earth before ostracoderms. 3. ostracoderms were the first to die. 4. plateosaurus died after the ostracoderms. 5. cave bears are the oldest fossils.

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