If the gas in the piston above has a volume of 20.0 L at a
temperature of 25 °C, what is the volume of that gas when it
is heated to 100 °C if the pressure remains constant?

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount