61. From the molar heats of formation in appendix g, determine how much heat is required to evaporate one mole of water: h2 o(l) ⟶ h2 o(g).

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

How many moles are in 43.9 l of oxygen