Intérprete los siguientes ejemplos según las unidades de concentración : A) en el aire el oxígeno representa el 21% en volumen

B) una disolución concentrada comercial de ácido clorhídrico HCI tiene una concentración de 135% en masa

C) una disolución diluida de hidróxido de sodio presente en un laboratorio puede tener una concentración de 2M (molar)

ayuda plis no entiendo muy bien el problema
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practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.